The best treatment for an acute thigh contusion is? What should the athlete wear when he/she returns?
The best treatment for an acute thigh contusion is to wrap your thigh with a wet bandage to insulate skin. This is important because, you could become more injured if you didn't do proper steps to the healing process.
The site of final maturation and storage of sperm cells before their ejaculation is:
a. seminal vesicles
b. seminiferous tubules
c. epididymus
d. glans penis
e. sperm bank
b. seminiferous tubules
The site of final maturation and storage of sperm cells before their ejaculation is epididymis. So, the correct option is (C).
What are Sperm cells?Sperm is defined as the male reproductive cell or gamete in the heterozygous forms of sexual reproduction. Animals which produce motile spermatozoa (sperm) with a tail is known as a flagellum while some red algae and fungi produce non-motile sperm cells which is known as spermatia.
The function of a sperm cell is to be released during sexual intercourse which meets an ovum which is the egg cell is biologically produced by the female body. Once they unite, the sperm will penetrate and fertilize the egg to create new genetic material.
At the top of each testicle is the epididymis, which is a cord-like structure where sperm mature and are stored.
Thus, the site of final maturation and storage of sperm cells before their ejaculation is epididymis. So, the correct option is (C).
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Saltatory conduction:
a. can occur in unmyelinated axons
b. happens due to an even distribution of voltage-gated Na+ channels
c. encodes only action potentials that are initiated in response to pain.
d. occurs in unmyelinated axons and happens due to even distribution of voltage-gated Na+ channels
e. occurs only in myelinated axons
Answer:
Saltatory conduction:
( e ) occurs only in myelinated axons
Explanation:
Saltatory Conduction -
The propagatory action of the potentials along the myelinated axons via one node of Ranvier to next node by increasing the conduction velocity of the action potentials is called the Saltatory Conduction .
The nodes of Ranvier that are uninsulated are the places in axon , which are responsible for the exchange of ions across the axon membrane and further regenerating the action potential between the axon which is insulated by myelin .
Saltatory conduction is the rapid transmission of nerve impulses along myelinated axons. It occurs due to the insulation provided by the myelin sheath and the jumping of action potentials between nodes of Ranvier.
Explanation:Saltatory conduction refers to the rapid transmission of nerve impulses along myelinated axons. It occurs because the myelin sheath insulates the axon and allows the action potential to jump from one node of Ranvier to the next, skipping the non-myelinated regions. This process greatly speeds up the conduction of nerve impulses.
In saltatory conduction, the voltage-gated Na+ channels are not evenly distributed along the axon. Instead, they are concentrated at the nodes of Ranvier. These nodes are the areas between the myelin sheaths where the axon is exposed.
Therefore, the correct answer is e. occurs only in myelinated axons.
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Which of the following statements is FALSE about fluid compartments and body fluid composition?
(a) Males generally have more muscle mass and therefore more water content than females
(b) Fluids such as lymph and plasma would be considered transcellul ar fhaids
(c) Nat and CI- are more heavily concentrated in extracellular fluids
(d) Most water inside the body is contained within the intracellular
Answer:
Out of the four given statements, the false statement is
option d)
Explanation:
a) Muscle mass and hence water content is greater in males than in females
b) Transcellular fluid is the portion of total water content in the body which is contained within the lined spaces of epithelial tissue. It is a part of the extracellular fluid which includes plasma and lymph can also be considered as tanscellular fluid.
c) Na+ and Cl- are the major content of extracellular fluids
d) About 60% of water inside the body is contained within extracellular and not in intra cellular.
Most water inside the body is contained within the intracellular is false about fluid compartment and body fluid composition.
What is Fluid compartment and body composition?Fluid compartment refer to fluid present inside all cells of the body which comprises of a compartment system that is largely segregated from other systems by hydrostatic pressure. This pressure help to exert a fluid against a wall.
Body fluid composition is refers to total fluid constituents or materials that are in the body. This involve the percentages of fat, bone, water and muscle in human bodies
Therefore, Most water inside the body is contained within the intracellular is false about fluid compartment and body fluid composition.
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Define and compare the process of external respiration and internal respiration.
Answer:
External respiration:
External respiration may be defined as the process of exchange of carbon dioxide and oxygen between the body and external environment. This is a mechanical process and may or may not require ATP. Only gases are exchanged in the external respiration process. This process may be voluntary or involuntary in nature.
Internal respiration:
Internal respiration may be defined as the process of diffusion of oxygen from blood into the interstitial fluid and carbon from the interstitial fluid into the blood. This is a chemical process that requires ATP. Nutrients are broken down into smaller substances and ATP is produced during this process. Internal respiration is an involuntary process.
When asthma attacks, the patient can hardly breathe. Which of the following should probably be administered to the patient?
a. norepinephrine, to relax smooth muscle in the bronchioles and increase airflow
b. antihistamine, to counteract the bronchoconstriction caused by histamine
c. ACh, to increase bronchoconstriction
d. a and b are correct
e. a, b and c are correct
Answer:
The answer is D: A and B are correct
Explanation:
During an acute asthmatic crisis it is mandatory to act quickly to improve the ventilation of the patient, the use of bronchodilators and antistamines through the nose, give good results in these conditions, especially in children.
Which of the following statements is FALSE about the glomerulus and the processes that occur there?
a. Capsular hydrostatic pressure refers to the pressure of fluid pressing on the capsule and opposes filtration
b. Net filtration pressure in the glomerulus is the difference between forces favoring filtration and forces opposing filtration
c. Blood from the afferent arteriole is filtered by size when it enters the glomerulus because of the many fenestrae.
d. Vasoconstriction of the efferent arteriole lowers glomerular filtration rate.
Answer:
The correct answer is option D.
Explanation:
The vasoconstriction or the narrowing of the blood vessels regulate the filtration rate of the glomerulus. The afferent arteriole vasoconstriction decreases the flow of blood to the glomerulus thus, decreases the filtration rate
The vasoconstriction of the efferent arteriole increases the glomerular filtration rate due to the increase in the blood level in the glomerular capillaries.
Thus, option D is the correct option.
The false statement about the glomerulus is that vasoconstriction of the efferent arteriole lowers the GFR, whereas it actually increases the GFR by increasing the hydrostatic pressure in the glomerulus.
Explanation:The false statement about the glomerulus and the processes that occur there is option (d): Vasoconstriction of the efferent arteriole lowers glomerular filtration rate (GFR). Actually, vasoconstriction of the efferent arteriole typically increases GFR by increasing hydrostatic pressure within the glomerulus. The net filtration pressure in the glomerulus is indeed the difference between forces favoring filtration and forces opposing filtration, as stated in option (b). In option (a), capsular hydrostatic pressure does oppose filtration by pressing on the capsule's fluid. For option (c), blood from the afferent arteriole is filtered by size as it enters the glomerulus, which is facilitated by the many fenestrae (pores) present that allow the passive diffusion of solutes, except for macromolecules like proteins.
You see a 30-month-old who speaks in mixed Spanish and English. The child’s vocabulary is normal but at the low end of the normal language spectrum. The parent is worried the child’s development will not be normal because she mixes up the two languages. You respond: a.“Your child’s speech is normal and bilingual children commonly intermix the wordsfrom both languages until about 3 years of age.” b.“Don’t be concerned because your child’s speech is normal and young childhood is the best time to learn languages.” c.“Stop speaking English at home to avoid confusion. She can always learn Englishoutside the home.” d.“The child may confuse the words now, but that will change by second grade.”
Hi !
You see a 30-month-old who speaks in mixed Spanish and English. The child’s vocabulary is normal but at the low end of the normal language spectrum. The parent is worried the child’s development will not be normal because she mixes up the two languages.
b.“Don’t be concerned because your child’s speech is normal and young childhood is the best time to learn languages.”
Which type of depression results in an individual with a manic-depressive illness.
a. major depression
b. dysthymia
c. bipolar disorder
d. seasonal affective disorder
e. all of these disorders
Answer:
The correct option is : c. bipolar disorder
Explanation:
A manic depressive illness also known as bipolar disorder, is a serious mental disorder in which the person experiences extreme mood swings ranging from manic highs to depressive lows. The manic highs includes high energy, abnormally elevated mood and reduced need for sleep. Whereas, depressive lows include low energy, loss of interest and even suicidal thoughts.
Therefore, bipolar disorder causes manic-depressive illness in an individual.
What cells recognize and destroy antibody-coated cells:
a) B- and T-lymphocytes
b) basophils and mast cells
c) dendritic cells
d) macrophages and neutrophils
e) NK cells
Answer:
The correct option is : e) NK cells
Explanation:
The antibody-dependent cell-mediated cytotoxicity, is a special cell-mediated mechanism of immune defense. This mechanism involves active lyses or the breakdown of the cell membrane of the antibody-coated target cell by an effector cell of the immune system.
The effector cell required in the antibody-dependent cellular cytotoxicity are known as Natural Killer cells or the NK cells. The NK cells show interaction with the IgG antibodies and recognize and destroy the antibody-coated target cells.
What is the name of the region inside the bladder bounded by the two uretal openings and the urethra?
a. Trigone
b. Detrussor muscle
c. Mucous layer
d. Transitional Epithelium
Answer:
The correct option is: a. Trigone
Explanation:
The trigone is the smooth triangular region that forms the floor of the urinary bladder above the urethra and consists of smooth tissues for the easy flow of urine. The trigone is connected to the two ureters and the urethra.
The trigone is very sensitive to expansion. Once expanded to a certain extent it signals the brain for the excretion of urine through the urethra.
The MOST common metallic ligating clips are made of which of the following materials?
A. chromium
B. aluminum
C. titanium
D. silver
Answer: Titanium
Explanation:
Titanium is used as the most commonly and widely used material as metallic ligating clips because they have more durability, malleability than other materials.
This properly helps the metal to bend and form clip. It is also used because of its least reactivity and does not gets corrode easily.
It is highly biocompatible as it does not releases ions around the surrounding tissues and organs.
Because of all the above reasons, titanium is used for making metallic ligating clips.
As a practicing nurse, how do you establish a therapeutic relationship? A positive environment for an initial assessment? Any differences for an assessment of an infant that you would make?
Answer:
As a practicing nurse, the establishment of therapeutic relationships with patients is really important, because it will ensure a positive interaction between the professional and object of care, as well as success in the endeavours from both to achieve the goals of care.
As such, there are several steps that can be taken to ensure that this environment is positive. The first is the attitude with which the nurse establishes raport. The nurse must show a positive, and professional attitude, be polite and nice with the patient, speak to them using words that are clear and appropriate to the age, and educational level of the patient and their family, explain her/his purposes with a set program of care, or a procedure, and always be available and ready to answer the questions that are pertinent to the patient´s care. It is also important for the nurse to show the patient that any and all information received during care will remain strictly confidential. THe initial relation can be established through greeting, introduction of the nurse to the patient and their family if available, explanation of the purpose of the nursing plan the nurse will carry out, and constant readiness to listen atentively to the patient and their family. This, if done during the initial assessment, attentive listening, explanation, and oppenness, as well as showing a professional, yet not unreachable stance, will ensure a good initiation of therapeutic relationship.
In children, there is something also very important. Nurses must always remember to treat the pediatric patient as a participant in care, not simply the object of care. Children, especially at a certain age, will show more reluctance to allow a nurse near if they fear, or are uncertain, of what will happen. Also, vocabulary, actions and attitude must be appropriate for the age of the child. Finally, the nurse must count with the help, or engage the participation, of the parents, or guardians, of the child. They will be vital to establish raport and a positive caring environment.
A patient is suspected of having tuberculosis. What type of stain would be the most diagnostic?
a) Spore
b) Gram
c) Acid fast
d) Capsule
e) Methylene Blue
Answer: c) Acid fast
Explanation:
The Tuberculosis or TB is a pulmonary disease characterized by fever, weight loss, night sweats and most of the times a productive cough. In some patients there is cough with blood in the sputum.
It is produced by a bacteria called Mycobacterium tuberculosis who has a rod (bacillus) morphology. Additionally, it has a special component in its cell wall: Mycolic acid, a very long fatty acid.
When there is a presumption of the presence of Tuberculosis, the most inexpensive way to look for it is by taking a sample of sputum or phlegm. Then, it has to be stained with the ACID FAST also called the ZIEHL NEELSEN stain. If there are bright red bacilli, then the presence of Mycobacterium tuberculosis is confirmed.
The biochemical reactions that degrade molecules such as nutrients are called:
A. anobolic reactions
B. amphibolic reactions
C. amphipathic reactions
D. catabolic reactions
E. near-equilibrium reactions
Answer:
D. catabolic reactions
Explanation:
Metabolism employs catabolic reactions to break down large molecules (nutrients) carbohydrates, fats, proteins as food is ingested. Then they degrade the molecules , being smaller and releasing the energy we need in order to function. The metabolic processes ocurr in all cell of the body.
Catabolism and anabolic reactions are good companions as they occur together.
Final answer:
The biochemical reactions that degrade molecules such as nutrients are known as catabolic reactions. They release energy by breaking down molecules, which contrasts with anabolic reactions that build larger molecules and require energy input.
Explanation:
The biochemical reactions that degrade molecules such as nutrients are called catabolic reactions. These reactions are exergonic, meaning they release energy as they break down molecules into smaller units. Their importance lies in the fact that they provide the energy cells need to perform vital processes. Anabolic reactions, on the other hand, are endergonic, requiring the input of energy to build larger molecules from smaller ones. Since the digestion of food involves the breakdown of molecules to extract energy, the reactions occurring during digestion are catabolic. The role of enzymes is to catalyze both catabolic and anabolic reactions, facilitating biochemical processes at the temperatures and concentrations found within living organisms.
The small intestine extends from _______________ to the large intestine for about 6 meters (20 feet). It is suspended in the abdominal cavity by the ___________ which anchors it to the posterior abdominal wall.
Answer:
The answer is 1) Pylorus, 2) Mesentery
Explanation:
The small intestine extends from the stomach at the level of the pylorus, to the large intestine. It is suspended in the abdomen by the mesentery that fixes it to the posterior abdominal wall.
The mesentery is a thin sheet of tissue, continuation of the peritoneum that is made up of two portions, one internal or visceral and the other external or parietal.
The estimated cranial capacities for Homo erectus are
A-1,250 to 1,800 cubic centimeters
B-400 to 800 cubic centimeters
C-300 to 750 cubic centimeters
D-750 to 1,250 cubic centimeters
Answer:
750 to 1,250 cubic centimeters.
Explanation:
Homo erectus is also known as the upright man. There species were present in the Pleistocene era. Their first fossil was dated back at 1.8 million years ago.
The brain capacity of Homo erectus was found to be between the 750 and less than 1,250 cubic centimeters. Their species had been derived into Homo heidelbergensis.
Thus, the correct answer is option (D).
Neurons are termed:
a. efferent if they conduct impulses toward the cell body
b. afferent if they conduct impulses toward the CNS
c. afferent if they conduct impulses away from the CNS
d. efferent if the conduct impulses toward the CNS
Answer:
The correct answer will be option B.
Explanation:
Neurons are the structural and functional unit of the nervous system. Based on the transmission of nerve impulse these neurons can be divided into two divisions :
1. Afferent neurons: Neurons which transmit the impulse from the periphery to CNS- brain or spinal cord. Sensory neurons are such neurons which carry the impulse of stimulus to CNS.
2. Efferent neurons: Neurons which transmit the signals from the CNS to the periphery or muscle which causes voluntary action. Motor neurons are considered efferent neurons.
Thus, option B is the correct answer.
which of the following is a characteristic of low- context culture
Answer:
Efficiency and speed are valued
Explanation:
Serous Membranes:
Identify the serous membrane the sentence describes.
A lubricating liquid in serous cavities _______________
Covers the surface of the lungs ____________________
Covers the surface of the abdominal organs ________________
Attaches the heart to the body cavity _____________________
Answer:
Serous Membranes:
Identify the serous membrane the sentence describes.
A lubricating liquid in serous cavities _______________
Covers the surface of the lungs ____________________
Covers the surface of the abdominal organs ________________
Attaches the heart to the body cavity _____________________
Explanation:
A lubricating liquid in serous cavities _______________
You can talk about two types of serous membranes, although in reality it is the same membrane with a different name depending on the position it occupies. Thus, the serosa that covers a cavity in a manner similar to the paint that covers the walls of a room, is called parietal serosa. While the serosa that covers the organs that are in that cavity, is called visceral serosa.
There are some organs whose serosa receives a specific name, usually due to the importance of its function. These are:
It covers the surface of the lungs ____________________
The pleura, around the lungs.
Covers the surface of the abdominal organs ________________
The peritoneum, which covers the abdominal cavity, enveloping a large part of the digestive organs.
Unite the heart to the body cavity _____________________
The pericardium, around the heart.
The serous membrane producing a lubricating liquid is serous fluid. The membranes that cover the lungs, abdominal organs, and the heart are respectively known as the pleura, peritoneum, and pericardium.
Explanation:The serous membranes described in your questions are as follows:
A lubricating liquid in serous cavities is known as serous fluid. The membrane that covers the surface of the lungs is referred to as the pleura. The membrane that covers the surface of the abdominal organs is known as the peritoneum. The serous membrane that attaches the heart to the body cavity is the pericardium.Learn more about Serous Membranes here:
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What is the Icd 10 code for gastroesophageal reflux disease?
Blood flow to a tissue will decrease if the:
a. metarterioles dilate.
b. level of carbon dioxide at the tissue increases.
c. pH falls.
d. precapillary sphincters relax.
e. level of oxygen at the tissue increases.
Answer: D) precapillary sphincters relax.
Explanation:
Blood flow to a tissue will decrease if precapillary sphincters relax as, capillaries provides glucose and oxygen to the cells and allows blood to flow through it when the muscle ring known as the precapillary Sphincters get relaxed. The blood flow is stopped when the precapillary sphincters constrict flow of blood. As, certain chemical signals causes feeder arterioles to dilate and bring more blood into local areas then, it causes precapillary sphincters to relax.
Blood flow to a tissue decreases if the level of oxygen at the tissue increases, as this signals that the tissue's oxygen needs have been met. On the other hand, conditions such as the dilation of metarterioles, relaxation of precapillary sphincters, increase in CO2 levels, or pH drop generally lead to an increase in blood flow, reflecting higher tissue activity.
Explanation:The blood flow to a tissue will decrease if the level of oxygen at the tissue increases (option e). This situation is contingent on the body's feedback mechanism that regulates the blood supply in relation to tissue needs. When a tissue's demand for oxygen is satisfied, or when the level of oxygen in the tissue increases, the body tends to reduce the blood flow to that particular area until the requirement rises again.
This way, blood and oxygen can be efficiently distributed to other areas where they may be needed more urgently. On the contrary, options a, b, c, and d describe conditions that typically trigger an increase in blood flow.
Dilation of metarterioles and relaxation of precapillary sphincters both promote the advancement of blood into the capillaries. Increased levels of carbon dioxide, the product of tissue metabolism, and a drop in pH, which often accompanies this, signal a high metabolic activity, hence requiring an enhanced blood supply.
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Which muscle is deeper in the body: the internal oblique muscle or the transverse abdominal muscle? Is the trapezius muscle located in the abdomen, back, head, neck, or thorax?
Answer:
The transverse abdominal muscle is present deeper in the body and the trapezius muscle is located in the back.
Explanation:
The transverse abdominal muscle is a layer of muscle that is present on the anterior (front) and lateral (side) abdominal wall and is present below the internal oblique muscle.
The trapezius muscle is a paired surface muscle which is located in the back. The main function of this muscle is to move the scapula and support the arm.
The transverse abdominal muscle is located deeper in the body compared to the internal oblique muscle. The trapezius muscle is not positioned in the abdomen, but can be found in the upper part of the back, extending to the neck and head.
Explanation:The transverse abdominal muscle is deeper in the body compared to the internal oblique muscle. This muscle is arranged transversely around the abdomen, similar to the front of a belt on a pair of pants. On the other hand, the internal oblique muscle is situated more superiorly and extends in the direction wherein our thumbs usually when other fingers are in the pants pocket.
The trapezius muscle is not located in the abdomen. Rather, it's a muscle that stabilizes the upper part of the back, thus it's located in the back and extends to the neck and the base of the skull. This muscle plays a crucial role in movements of the neck and shoulder.
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Which of the following is associated with the pharynx?
a. it begins at the external nares.
b. it is a tube lined with a mucous membrane
c. it s usually called the voice box or Adam's apple
d. it begins at the fauces and ends at the epiglottis
e. it is a tube composed of smooth muscle
Answer:
The answer is B: It is a tube lined with a mucous membrane.
Explanation:
The pharynx is a smooth tube approximately 12 cm long, which begins at the level of the neck and ends at the epiglottis, is related to both breathing and oral use; it is lined with a mucous menbrana; emits intelligible sounds, being the biggest resonator.
Where do you have smooth muscle fibers and where do you have collagen fibers?
Answer:
The smooth muscle is made up of a group of spindle-shaped cells, they do not have transverse striations, they are also known as non-wills and they will be found in the esophagus, intestine, stomach, uterus, blood vessels.
Collagen fibers are protein molecules that form fibers produced by connective tissue cells. They are found in 25% forming the skin and bones.
Smooth muscle fibers are found in the walls of hollow organs and passageways, while collagen fibers are present throughout the body.
Explanation:Smooth muscle fibers are found throughout various parts of the body, usually in the walls of hollow organs and passages such as the intestines, stomach, urinary bladder, respiratory tract, blood vessels and the iris of the eyes. These cells do not have striations, have a single nucleus, and are tapered at both ends. They are not under voluntary control, thus referred to as involuntary muscles.
On the other hand, collagen fibers are mainly located in the connective tissues of the body. Collagen is key in providing structural support and is abundant in the skin, ligaments, tendons, and bones. It is the primary component of the extracellular matrix and provides the tissue with strength and flexibility.
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Other symptoms of fat embolism include all the following:
a. AMS
b. Drowsiness
c. Seizures
d. petechiae
e. Nodular rash
Answer:
The answer is D petechiae.
Explanation:
The petechiae appear between 48 and 72 hours after the pathological condition is established, leading to punctiform lesions of petiquial aspect at the flank, anterior thorax and axilla. Petechiae occur when capillaries bleed and blood is shed on the skin.
Explain the process of transcytosis.
Answer:
Macromolecules are transported from one space to another through a process of transcytosis or transcellular transport. It consists of a series of steps that will allow the mobility of macromolecules from one extracellular space to another, through the cellular menbrain, through a vesicle formation process. These vesicles maintain a certain load inside. The processes that are generated for the transcytosis process are those of endocytosis and exocytosis.
Transcytosis is an active transport process that involves the movement of substances across a cell via endocytosis followed by exocytosis, powered by ATP and necessary for transporting large molecules that cannot pass through the plasma membrane on their own.
Explanation:Transcytosis is an active transportation mechanism that encompasses both endocytosis and exocytosis. In transcytosis, a substance is first ingested into the cell by endocytosis, where the cell membrane enfolds the substance into a vesicle. This does not just involve macromolecules but can include particles, parts of cells, or entire cells. Endocytosis also provides a route for the absorption of nutrients that cannot permeate the hydrophobic plasma membrane directly.
Once inside the cell, the vesicle may travel through the cytoplasm. It is transported to the opposite side of the cell, where it is then expelled via exocytosis. This intricate process allows the cell to move substances across its body, effectively working as a cellular transport system for large and specific molecules that cannot simply diffuse through the cell membrane. It is powered by ATP, thus qualifying as an active transport process. Additionally, it plays a role in both the intake of extracellular substances and the removal of waste or secretion of cellular products.
Boyle's law states that volume is ____________.
Answer:
Explanation:
Volume and Pressure are inversely related. Temperature is held constant.
P * V = P1 * V1 is the formula for Boyle's Law.
I think what you need to put in the blank is
volume is inversely related to pressure.
A one word answer is nothing going to say that.
Boyle's Law is a basic law in chemistry describing the behavior of a gas held at a constant temperature. The law, discovered by Robert A. Boyle in 1662, states that at a fixed temperature, the volume of gas is inversely proportional to the pressure exerted by the gas.
Which of the following is NOT true about muscle cells?
a. The sarcoplasmic reticulum and the t-tubules are physically fused together
b. It is multinuclear
c. The plasma membrane is called a sarcolemma
d. An AP arriving at the neuromuscular junction triggers the release of Calcium into the cytoplasm
Answer:
The correct answer will be option B.
Explanation:
The muscle cells are the long, cylindrical, tubular structure which is made up of the myofilaments- actin and myosin.
The plasma membrane of a muscle cell is known as sarcolemma and the cytoplasm of the cell is known as sarcoplasm. Each muscle cell has the small holes present on its sarcolemma through which the nerve impulse are transmitted from the sarcolemma to sarcoplasmic reticulum where calcium ions are released into the sarcoplasm.
In the given question the, the muscle cell is multi-nucleated which is the case of skeletal muscles only. The muscle cells have a single nucleus in smooth and cardiac muscles.
Thus, option B is the correct answer.
The correct answer is d. An AP arriving at the neuromuscular junction triggers the release of Calcium into the cytoplasm. This statement is not true about muscle cells.
Explanation:The correct answer is d. An AP arriving at the neuromuscular junction triggers the release of Calcium into the cytoplasm. This statement is not true about muscle cells. In reality, an action potential (AP) at the neuromuscular junction triggers the release of acetylcholine, which then causes a depolarization of the muscle cell membrane. This depolarization leads to the release of calcium ions from the sarcoplasmic reticulum, allowing for muscle contraction.
The sarcoplasmic reticulum and t-tubules are physically fused together in muscle cells, which allows for efficient communication between the plasma membrane and the sarcoplasmic reticulum during muscle contraction. This fusion is vital for the process known as excitation-contraction coupling.
The plasma membrane of muscle cells is called sarcolemma. This specialized membrane surrounds the muscle cell and helps maintain the internal environment of the cell.
Muscle cells are indeed multinuclear. Unlike most cells in our body that only have one nucleus, muscle cells contain multiple nuclei. These nuclei are necessary to provide adequate genetic material for the synthesis of proteins required for muscle contraction and maintenance.
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What is AIDS caused by?
A. a virus
B. a bacterium
C. mosquito bites
D. a mutation on a cell’s receptor site
Answer:
The answer is A: virus
Explanation:
AIDS (acquired immunodeficiency syndrome) is caused by the late-stage HIV virus; as a manifestation of the patient's great immune compromise, which is practically without defense to resist any infectious attack on the organism.