Answer: B. pressure changes in the thorax
Explanation:
The veins are the blood vessels which returns the deoxygenated blood from all the tissues and cells of the body back to the heart. The ventricular systole, venous valves, activity of the skeletal muscles and neural control over venoconstriction all influence the movement of the blood in the venous.
The pressure changes in the thorax occurs due to inspiration and expiration. During the process of inspiration, the diaphragm below the lungs contracts and moves downward while the muscles of the ribs pulls downward. When the size of the thoracic cavity increase the air pressure inside the cavity decreases and vice-versa. The pressure inside the thoracic cavity is not related with the movement of the venous blood as it regulates the exchange of the gases not the blood.
Ventricular systole does not contribute to venous blood flow; it impacts arterial flow. Venous return is aided by thoracic pressure changes, venous valves, skeletal muscle activity, and neural control over venoconstriction.
Explanation:The question asks which factors do not contribute to the movement of venous blood. The correct answer is A. ventricular systole, as this specifically refers to the contraction of the ventricles in the heart, which directly impacts the arterial blood flow rather than venous return. Venous blood movement is influenced by pressure changes in the thorax during respiration, the presence of venous valves preventing backflow, the activity of skeletal muscles which helps to 'pump' the blood back toward the heart, and neural control over venoconstriction which regulates the diameter of the veins to ensure proper blood flow.
Factors contributing to the return of blood to the heart include the smooth muscle action within the venous walls, venous valves, the skeletal muscle pump, and venoconstriction. These mechanisms work together to maintain a continuous flow of venous blood back to the heart despite the lower pressure compared to arteries and the pull of gravity, especially in the extremities.
Where is the greatest amount of the world’s carbon found?
atmosphere
seafloor sediments
ocean
plants and animals
Answer:
The best answer to the question: Where is the greatest amount of the world´s carbon found, would be: the seafloor sediments, where the ocean deposits this element.
Explanation:
Although the most logical answer to this question would be the atmosphere, given that carbon is present in the form of carbon dioxide, the reality, and according to research done, is that carbon, as an element is present most of all in the ocean and it is the seafloor sediments that have become the biggest reservoirs of elemental carbon.
PLEASE HELP ME!!!!!
RNA primase synthesizes RNA primer that attaches itself at the initiation point of replication. RNA primer constructed during DNA replication needs to be replaced because RNA differs from DNA. It contains __________ instead of ________.
Janice is in the middle of a distinct period of an abnormally and persistently elevated mood. In the last week she has cleaned her house from top to bottom (breaking windows and dishes in the process), bought a new car that she can’t afford, and dug up most of her yard in case she might want a garden next year. Janice is experiencing ________.
Answer:
Mania
Explanation:
Mania is one of the phases of bipolar disorder characterized by a state of intense euphoria, with increased energy, agitation, restlessness, mania of grandeur, less need for sleep, and may even cause aggression, delusions and hallucinations. People infected with this disease exhibit strange behavior with abnormal and derogatory attitudes.
The symptoms associated with mania are similar to what Janice is showing. Janice probably has the disease, but only a professional diagnosis can prove it.
Which of the following provides a first line of defense against pathogens? Which of the following provides a first line of defense against pathogens? intact skin and mucous membranes complement inflammation antimicrobial proteins
What are “control” and “regulation” in metabolism?
Answer:
Explanation:
?
In the plasma, the quantity of oxygen in solution is ________.
A. not present except where it is combined with carrier molecules
B. about equal to the oxygen combined with hemoglobin
C. greater than the oxygen combined with hemoglobin
D. only about 1.5% of the oxygen carried in dissolved form
Answer:
D. only about 1.5% of the oxygen carried in dissolved form is correct answer.
Explanation:
Plasma is a component of blood, it has many functions in our body like fighting against diseases, clotting the blood.
In the plasma, the quantity of oxygen in solution is about 1.5% of the oxygen carried in dissolved form and 98.5% of the oxygen is bound to hemoglobin.
Thus option (D) only about 1.5% of the oxygen carried in dissolved form is correct.
In the plasma, only 1.5% of the oxygen is carried in dissolved form. Most oxygen is carried by hemoglobin in red blood cells.
Explanation:In the plasma, the quantity of oxygen in solution is generally quite small. The correct answer is D. only about 1.5% of the oxygen carried is in dissolved form. Most of the oxygen in the blood is actually carried by hemoglobin, a protein found in red blood cells. Hemoglobin binds to oxygen in areas of high oxygen concentration, such as in the lungs, and releases it in areas of lower concentration, such as in the body's tissues. Only a small fraction of the oxygen — about 1.5% — is dissolved directly into the plasma.
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Which of the following carries no sensory information?
trigeminal nerve
vestibulocochlear nerve
hypoglossal nerve
optic nerve
Answer:
Hypoglossal nerve
Explanation:
The hypoglossal nerve is a motor nerve. It is found under the tongue and its main function is tongue movement. It controls the muscles of the tongue that we use when we speak and also when we eat. Its function can be damaged by a stroke, and that is why stroke vitims usually slur.
The hypoglossal nerve (XII) ( Option C ) carries no sensory information. It is purely a motor nerve that controls muscles of the tongue.
The question is asking which nerve carries no sensory information. Among the options given:
Trigeminal nerve carries both sensory and motor information.Vestibulocochlear nerve carries sensory information for hearing and balance.Optic nerve carries sensory information for vision.Hypoglossal nerve is purely a motor nerve that controls muscles of the tongue.Therefore, the hypoglossal nerve (XII) carries no sensory information. Understanding the specific functions of different cranial nerves is essential in neurobiology, which deals with various sensory and motor pathways in the body.
Complete question:
Which of the following carries no sensory information?
A. trigeminal nerve
B. vestibulocochlear nerve
C. hypoglossal nerve
D. optic nerve
What is the name of the oldest-living tree in the world?
Answer:
clonal trees
Explanation:
The branch of psychology that studies how a person's thoughts, feelings, and behavior are influenced by the presence of other people and by the social and physical environment is called "_____ psychology."
Answer:
Social psychology is a correct answer.
Explanation:
The branch of psychology that studies how a person's thoughts, feelings, and behavior are influenced by the presence of other people and by the social and physical environment is called '' Social psychology."
Social psychology studies about people's feelings, behaviors and thoughts are influenced by the involvement of other people.
It explains the cause of how the feelings, beliefs, thoughts, goals, and intentions are influenced by others.
Thus Social psychology is the branch of psychology which deal with the studies human interaction in the social groups and explain the social situation's impact on human behavior.
What is the phenotypic ratio of a monohybrid cross between two heterozygous parents?
Select one:
a. 1:2:1
b. 9:3:3:1
c. 1:2:2:1
d. 3:1
The phenotypic ratio of a monohybrid cross between two heterozygous parents is 9:3:3:1
The Phenotypic ratio in a monohybrid cross between two heterozygous parents is 3:1.
In biology, a monohybrid cross is a cross between two organisms involving only one trait. Recall that genes occur in pairs called alleles, the expressed traits of individuals depends on the dominant (expressed) and recessive genes in the alleles.
Two heterozygous parents may be shown as Tt. The gene T is dominant while the gene t is recessive. We can see that three of the offspring has the dominant T gene hence they will express the trait represented by T. Only one organism will express the trait represent by t. Therefore, the phenotypic ratio is 3:1.
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"Some sympathetic preganglionic fibers stimulate the adrenal medulla to release norepinephrine and epinephrine into the blood, producing what is commonly called a "surge of adrenaline." True False
Answer:
True
Explanation:
Epinephrine and norepinephrine are the hormones secreted by the adrenal medulla and are also called adrenaline and noradrenaline, respectively. During stress conditions, the hypothalamus stimulates the preganglionic neurons of sympathetic division.
These preganglionic neurons stimulate the chromaffin cells to secrete epinephrine and norepinephrine to prepare the body for fight or flight response. The increased level of epinephrine and norepinephrine hormones in the blood is called “surge of adrenaline”
True, the activation of sympathetic preganglionic fibers leads to the adrenal medulla releasing epinephrine and norepinephrine, initiating the fight-or-flight response.
Explanation:The statement you're asking about is true. Some sympathetic preganglionic fibers, upon activation, stimulate the adrenal medulla to release epinephrine (often referred to as adrenaline) and norepinephrine (noradrenaline) into the bloodstream. This response is part of the fight-or-flight response, which prepares the body to face or escape from potential threats. The sympathetic nervous system triggers this response, which originates from neural impulses in the hypothalamus in reaction to stress. When these neurotransmitters are released into the blood, they cause physiological changes such as increased heart rate, increased blood pressure, and elevated blood sugar levels to support the body's need for immediate energy and heightened awareness.
Which of the following would be a body response when stepping outside without a coat on a snowy day?
A. Blood vessels in the skin narrow and contract.
B. More liquid is transported by the body to the skin for insulation.
C. Sebaceous glands secrete more sebum.
D. Blood vessels in the skin expand
Answer:
A. Blood vessels in the skin narrow and contract.
Explanation:
If we will step outside without a coat on a snowy day then our blood vessels in the skin will become narrow and contract. It is a mechanism to conserve heat within our body in cold weather. If the blood vessels in the skin will become narrow and contract then less blood will flow in the blood vessels, this phenomenon is known as vasoconstriction. The blood of our body is warm but the exposure to the cold weather will cause the heat of the blood to dissipate into the environment. But constricted blood vessels will have less blood and hence heat loss is minimized which keeps the internal temperature of the body as normal even if outside environment is cold.
Answer:
A. Blood vessels in the skin narrow and contract.
Explanation:
Spores are produced by _____ in the diploid phase. meiosis eggs mitosis fertilization (answer quick and ill make u brainliest)
Answer:
Spores are produced by meiosis in the diploid phase.
Answer:
Meiosis.
Explanation:
Meiosis may be defined as the type of the process of cell divisions in which a parent cell divides into four daughter cells. The chromosome number reduces to half in the daughter cells.
Spores are produced as meiosis as meiosis generally occurs in the cell that are involved in reproduction. Spores are haploid cells that are only produced by the process of meiosis.
Thus, the answer is meiosis.
What term refers to the point below the surface where an earthquake begins? A. Hypocenter B. Seismic zone C. Seismogenic zone D. Epicenter
Answer:
A. Hypocenter
Explanation:
Hypocenter refers to the point below the surface where an earthquake begins.
The earthquake beginning is at A) Hypocenter.
Explanation:The area inside the Earth, which acts as the source of origin of earth quake is called as center (or hypocenter) of the seismic tremor. The point at Earth's surface straightforwardly above the hypocenter is known as the focal point of the quake.
The shaking will be experienced more at this region as it is the source of the origin. Here and there the ground surface breaks along the fault. Once in a while, the development is profound underground and the surface doesn't break.
Which activity is part of the inflammatory response? skin producing complement proteins phagocytes producing mucus complement proteins signaling phagocytes body temperature decreasing
Answer:
Phagocytes producing mucus
Explanation:
Phagocytes producing mucus is part of the inflammatory response.
Mucus is a great part of healing because it prevents any more germs from infecting the wound.
Answer:
Phagocytes producing mucus
Explanation:
Last year, Kylee moved to a new town, got hooked on heroin, and had some medical scares that made her realize she wants to quit her substance abuse for good. Her parents have offered to help financially, but they're upset with things that she's done and said they don't want to see her again until she's been clean for at least one year. What is the best treatment option for Kylee?
Answer:
A residential program that removes her from her current living situation, followed up with support groups to offer accountability
Explanation:
Kyle wants and needs to change and quit her addictions, but she won't be able to do it alone, she needs professional help and emotional support to make this important step in her life.
Since Kyle can't count on her parents until she's clean, the best Kyle can look for is a residential program that removes her from her current life situation, accompanied by support groups to offer accountability.
That way Kyle will have the necessary follow-up to avoid relapsing, getting rid of her addictions, and making peace with her parents.
What does the equipotentiality hypothesis suggest would happen if the hippocampus was damaged? a. another part of the brain would compensate for the damage by taking over the memory function normally managed by the hippocampus b. areas near the hippocampus would decay, followed by a cascading failure of the brain leading to death c. people would lose their ability to feel fear d. people would become comatose
Answer:
a. another part of the brain would compensate for the damage by taking over the memory function normally managed by the hippocampus
b.areas near the hippocampus would decay, followed by a cascading failure of the brain leading to death
c. people would become comatose
d. people would lose their ability to feel fear
Explanation:
Equipotentiality is the hypothesis that the brain can transfer functional memory from injured to intact areas. Therefore, option (A) is correct.
What is equipotentiality hypothesis?The concept of equipotentiality postulates that, in the event of a brain injury, the brain is able to move functional memories away from the region of the brain that has been injured and into other regions of the brain that have not been affected by the injury. Karl Spence Lashley included this concept as a component of his law of mass action that he developed.
If the hippocampus were damaged, the equipotentiality hypothesis suggests that another part of the brain would compensate for the damage by taking over the memory function that is normally managed by the hippocampus.
Therefore, option (A) is correct.
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Most of the weathering of Cleopatra’s Needle is caused by ____.
Question 16 options:
hydrolysis
chemical weathering
oxidation
frost wedging
Answer:
chemical weathering
Explanation:
The Cleopatra's Needle is a monument in New York. Its origin actually lies in Egypt, and it has been in Egypt for over 3,000 years, but it has been sent to New York as a gift for the United States by the Egyptians. While the monument already was partially damaged by weathering in the desert in Egypt, the weathering increased significantly ones the monument was brought in New York. The chemical weathering in New York has been much stronger, with constant acid rains and freeze-thaw cycles doing a lot of damage to the red granite by which the monument is made off. A plan has been made to preserve it, as its surface has been totally damaged, with the hieroglyphs nowhere to be found.
Describe animal interactions that affect populations in the tundra ecosystem.
Answer:
Animals migrate to eat insects that live there year round.Many animals in the tundra hibernate during the long, cold winter months.
Animals are most active in the short summer as the snow melts and shallow wetlands form
Explanation:
Answer:
Interferes with each other number/count and hence affects the activities physical or chemical associated with it .
Explanation:
There are several varieties of animals in the tundra region in which some are extremely dangerous animals such as polar bear which feed on both flesh and plants such as seals, fish, birds, caribou, musk oxen, berries, and leaves. They are extremely powerful with huge diet. The species on which it feed has a slow growth rate as compared to the rate at which they are fed upon. Thus, the population of these lower level animals is in danger. Along with it several animals hibernate for a long period due to extreme cold and hence the population of species on which they feed upon grow tremendously
Also some species of animals feed on microorganism that are the only source of disintegrating dead bodies of animals and plants. Excessive feeding on such microorganism may lead to problem of improper or incomplete or slow dead organic matter disintegration
What is an allele? A. Trait form that is hidden by a dominant gene B. One of different forms of the same gene C. Trait form that is displayed by recessive genes D. Identical copies of two different genes
Microbes are often identified using biochemical tests that detect specific enzymes of metabolic pathways. E. coli typically ferments lactose, whereas Shigella does not. If a pure culture of each bacterium was placed in a tube containing lactose as the only food source, and a chemical indicator changed color after a pH change, what would the tubes look like after the bacteria were incubated?
Answer: There will be change in the tube in which E.coli will be incubated and there will be no change in the test tube in which Shigella is incubated
Explanation:
Lactose Fermentation Test is done to see which bacteria ferments lactose. pH and color indicator is attached to observe the change. The pH goes slightly down because of formation of Acid and due to this reason a color change is also seen during this test.
As E.coli typically ferments lactose so there will change in color and pH in the test tube incubated with E.coli, while there will be no change in the test tube incubated with Shigella.
Which of the following is a disadvantage of asexual reproduction? Only 1 parent is needed It requires more energy and resources It can be done very quickly Offspring may be more susceptible to disease because they are genetically identical
Answer:
Offspring may be more susceptible to disease because they are genetically identical
Explanation:
Asexual reproduction is the process that includes the production of progeny from a single parent. Since there is no gametic fusion and the only single parent is involved, the progeny is genetically identical to the parents and among themselves.
Some of the genetic variations produced during sexual reproduction are beneficial and increase the survival chances of individuals by making them better adapted to surroundings or imparting beneficial traits such as disease resistance.
Lack of genetic variations among the progeny makes them more likely to get infected with diseases.
Which of these describes loose connective tissue? (A) It is a loose weave of fibers that functions as a packing material. (B) It is composed of many fibers that connect bone to bone and muscle to bone. (C) It is a rigid material that provides structural support. (D) It transports nutrients and gases from one part of the body to another.It plays a role in padding, insulation, and energy storage.
Answer:
A.it is a loose weave of fibers that functions as a packing material
Loose connective tissue is a loose weave of fibers that functions as a packing material.
One form of connective tissue is called loose connective tissue which has a disordered arrangement of fibers. It acts as a packing material by filling organ gaps, supporting and cushioning delicate structures. It is composed of cells, fibers (including elastic and collagen fibers) and ground material. Such tissue serves as a source of padding, insulation and stored energy. Areolar tissue and adipose tissue are two examples of loose connective tissue.
Therefore, the correct option is A.
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Which enzyme breaks the hydrogen bonds during replication?
The enzyme known as helicase plays a pivotal role in the process of DNA replication by effectively breaking the hydrogen bonds that exist between the two complementary strands of DNA.
Explanation:Helicase, a vital enzyme in DNA replication, assumes the crucial task of unwinding the DNA double helix. Its primary function is to disrupt the hydrogen bonds, which are responsible for holding the two strands of DNA together. As these bonds are severed, the DNA strands separate, providing access to the genetic information they contain. This initial unwinding step is essential for DNA replication to proceed accurately and efficiently.
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The enzyme responsible for breaking hydrogen bonds during DNA replication is DNA helicase. It unwinds the double-stranded DNA, separating the strands for replication.
During DNA replication, the enzyme responsible for breaking the hydrogen bonds between the complementary nitrogenous bases is called DNA helicase. DNA helicase plays a crucial role in the unwinding of the double-stranded DNA molecule. It functions by traveling along the DNA double helix, using energy from ATP hydrolysis to separate the two strands by disrupting the hydrogen bonds that hold the base pairs together.
As DNA replication progresses, the leading and lagging strands are exposed, making them accessible for the replication process. DNA polymerases can then synthesize new complementary strands on each of the separated parent strands. This process ensures the accurate duplication of genetic information by unwinding and separating the DNA strands and allowing them to serve as templates for the synthesis of new DNA molecules.
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kmf Of the 40 specimens of bacteria in a dish,3 specimens have a certain trait. If 5 specimens are to be selected from the dish at random and without replacement, which of the following represents the probability that only 1 of the 5 specimens selected will have the trait?
Answer:
[tex]\frac{C^{3}_1* C^{47}_4}{C^{40}_5}[/tex]
Explanation:
It is given that out of 40, total 5 specimen are selected.
Thus, the number of ways in which 5 specimens are selected from a given sample of 40 is given by
[tex]C^{40}_{5}\\[/tex]
Number of specimen with certain trait is equal to 3.
Now, total 5 specimen are selected out of which one specimen is selected from the set of specimen that has certain trait (i.e out of 3) while the remaining four specimen will be selected from the rest [tex]40-3=37[/tex] specimen.
Thus, the probability of choosing only 1 of the 5 specimens with the trait is equal to
[tex]\frac{C^{3}_1* C^{37}_4}{C^{40}_5}[/tex]
Your supervisor asks you to set up a pure culture of a bacterial species he is researching. He tells you that this species is a fastidious, halophilic, gram-positive mesophile that does not have catalase or superoxide dismutase. What type of culture medium and environmental factors must you use to grow this organism?
Answer:
This bacterial species needs to be grown in a nutrient agar of high salt (NaCl) concentration. It needs to be incubated at moderate temperature of between 20°C and 45°C. This species needs to be kept in an oxygen free environment, a sealed jar containing an oxygen- free gas mixture.
Explanation:
Fastidious: indicates that the bacterial species requires special nutrients and specific environmental conditions to grow.Halophilic: refers to "salt- loving" bacteria, who thrive in conditions with high salt concentrations.Gram -positive: indicates that the bacterium tested positive in the Gram stain test. Mesophile: indicates that the optimum temperature fro the bacteria to grow in is between 20°C and 45°C.This species does not have catalase or superoxide dismutase which indicates that this is an obligate anaerobe because both of these enzymes are required for aerobic respiration. This species cannot be exposed to oxygen.True or false? A codon is a group of three bases that can specify more than one amino acid.
A single codon corresponds to one specific amino acid, making the statement false. The codons for tyrosine are the same in both plants and humans, which is true. The start codon signifies the beginning of translation and also encodes for the amino acid methionine, which is also true.
The statement that a codon can specify more than one amino acid is false. A codon, which is a group of three nitrogen bases in nucleic acids, corresponds to one specific amino acid in the genetic code. There are some instances, known as the wobble effect, where different codons may code for the same amino acid, but a single codon does not encode for multiple amino acids.
The codons that specify tyrosine are indeed the same in both plants and humans, reflecting the virtually universal nature of the genetic code. This fact emphasizes the similarity in the way that different organisms translate RNA sequences into proteins.
Regarding the start codon, the statement is true. The start codon, typically AUG, not only signals the beginning of the protein-coding region but also codes for the amino acid methionine.
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Which of the following describes a phenomenon that occurs when we observe plants that wilt?
A. The xylem releases all its water.
B. The stomata close, cutting off transpiration and gas exchange.
C. The roots begin to rot, causing them to no longer uptake water.
D. The plant begins absorbing oxygen and releasing carbon dioxide into the atmosphere.
Answer:
A: The xylem releases all it's water
Explanation:
This is so because wilting is the loss of rigidity of non-woody parts of plants. This occurs when the turgor pressure in non-lignified plant cells falls towards zero, as a result of diminished water in the cells. The rate of loss of water from the plant is greater than the absorption of water in the plant.
Answer:
A
Explanation:
What are three questions that focus on the cause and effect relationship between the genetic code and gene expression, mechanisms of gene regulation and/or the role of DNA segments that do not code for
proteins?
(If you can provide further info that would be great, thank you!)
Three questions that focuses on the cause and effect relationship between the genetic code and gene expression, mechanisms of gene regulation and/or the role of DNA segments that is not involved in coding the proteins are:
i. Illustrate the process of translation and explain it with the help of a diagram.
ii. What are codons? Name the stop codons in eukaryotes.
iii. What are exons and introns? Explain what happens to the introns during the process of transcription and translation?
The cause and effect relationship between the genetic code and gene expression, mechanisms of gene regulation, and the role of DNA segments that do not code for proteins.
Explanation:Three questions that focus on the cause and effect relationship between the genetic code and gene expression, mechanisms of gene regulation, and the role of DNA segments that do not code for proteins are:
How does a change in the genetic code affect gene expression?What are the mechanisms by which gene regulation occurs?What is the function of DNA segments that do not code for proteins?The genetic code is a set of rules that determines the sequence of amino acids in a protein. Changes in the genetic code, such as mutations, can lead to alterations in gene expression, affecting the production of specific proteins. Gene regulation involves the control of gene expression, and several mechanisms, such as DNA methylation and transcription factors, play a role. Additionally, non-coding DNA segments, such as introns and regulatory sequences, have important functions in gene regulation and other cellular processes.
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What do scientists call the aliens and odd organisms that live below the bottom of the ocean?
Intraterrestrials are what scientists call aliens odd organisms that live
below the bottom of the ocean.
There are organisms which live deep in places in the biosphere such as the
following:
Deep in water bodies such as oceansDeep in rock particlesThese organisms are mostly unicellular and possess prokaryotic cells which
aids their survival in such conditions. The organisms ranges from viruses,
archaea etc.
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