Answer: This event is called a genetic mutation
Explanation:
This can be explained when the genetic make up of a species is altered such that a new genetic branch is formed,a information is contained in the DNA leading to a visible change outwardly.
The lengthy small intestine receives secretions from the ____________ and ____________, completes digestion of the nutrients in ________________, absorbs the products of digestion, and transports the remaining residues to the ________________ intestine.
Answer:The lengthy small intestine receives secretions from the ______pancrease______ and ______liver______, completes digestion of the nutrients in _________chyme_______, absorbs the products of digestion, and transports the remaining residues to the ________large________ intestine.
Explanation: digestion of food is necessary for absorption of nutrients. In this process food is broken down into forms that can be absorbed by the body . food is broken down by the teeth and the enzymes in saliva,when it is in the mouth. From there it moves to the stomach through the oesophagus. In the stomach, the content is further mixed with enzymes and the churning breaks down food further.From the stomach food moves to the small intestine. In the small intestine, digestive enzymes from the pancreas and liver acts on food. The small intestine is where digested food is absorbed.it has a large surface area and finger-like projection called villi to carry out the function of absorbing nutrients.
From there, undigested food us passed to the large intestine from where it is passed out through the anus
What have scientists learned about the classification of amphibians
Answer:
Scientists learn a number of things about the classification of amphibians is that there are three categories of amphibians that are different from one another.
Explanation:
Amphibians have three categories i. e. the first one is frog and toad, the second one is salamander and the third one is newts and caecilians. All of these have one thing in common that they require water for their survival. They are the organisms which are capable of living on both land and water environment. About 6,200 species of amphibians were discovered by the scientists.
Answer:
Reptiles are more closely related to birds than amphibians.
Reptiles and birds are so closely related that according to modern classification, they are part of the same group.
Explanation:
A patient is being treated with albendazole [Albenza] for neurocysticercosis caused by larval forms of the pork tapeworm. Which statement by the patient indicates a need for further teaching about the drug regimen?
A. "I may need to take this medication for a month before the infestation is cleared."
B. "I should take this drug with a fatty meal to improve absorption."
C. "I will need to have liver function tests before and during treatment."
D. "I will take the drug in 3 consecutive cycles of 28 days, followed by 14 drug-free
days."
Answer:
D. "I will take the drug in 3 consecutive cycles of 28 days, followed by 14 drug-free days."Explanation:
Albendazole us a type of medicine that is used to treat the infections that are caused due to certain worms. This drug prevents the larval form to multiply or their growth. Since the larval forms of the tapeworm Taenia solium are responsible to develop neurocysticercosis disease. This disease mainly affects the central nervous system and generally causes epilepsy and some other neurological infections. So drug such as albendazole is taken in a consecutive way that is based on 8 to 30 days to treat this disease. This drug is used with a high-fat meal to increase absorption.Chloroplasts found in plants arose via ________.a. endosymbiosis of euglenids b. endosymbiosis of cyanobacteria c. endosymbiosis of proteobacteria d. endosymbiosis of dinoflagellates
Answer:
b. endosymbiosis of cyanobacteriaExplanation:
A chloroplast is an organelle that plays important roles in the plants during the process of photosynthesis. It has certain pigments that are responsible for the trapping of the sunlight such as chlorophyll and some other pigments. Since each chloroplast has two membranes so named as the double-membrane organelles like mitochondria and some other organelles. It is considered that the evolution of the chloroplast took place by the process of endosymbiosis of cyanobacteria. Cyanobacteria are such kinds of prokaryotic organisms that have the ability to prepare their food by the mechanism of photosynthesis.Chloroplasts in plants originated from the endosymbiosis of cyanobacteria, wherein an ancestral prokaryote engulfed a cyanobacterium. This event is referred to as primary endosymbiosis and has occurred twice in the evolutionary history of eukaryotes.
Explanation:The chloroplasts found in plants originated through a process known as endosymbiosis of cyanobacteria. The theory suggests that an ancestral prokaryote engulfed a photosynthetic cyanobacterium, which eventually evolved into modern-day chloroplasts. This is known as primary endosymbiosis, leading to chloroplasts surrounded by two membranes. Similarities in DNA sequences between cyanobacteria and algae also support this theory. The acquisition of endosymbionts happened twice in the course of eukaryotic evolution, with one notable event being the inception of the Archaeplastida lineage, a result of endosymbiosis with cyanobacteria.
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When brown tree snakes were accidentally introduced onto the island of Guam, they had no natural predators. These snakes sought out and ate many of the eggs of insect-eating birds. What probably occurred following the introduction of the brown tree snakes?
Answer:
there were no more insect eating birds. they went extinct
Answer:
The insect population increased.
Explanation:
Bile from the liver and digestive juices from the pancreas enter which section of the small intestine?
Bile from liver and digestive juices from pancreas are released into duodenum of the small intestine. Both these substances are crucial for the process of digestion, including breaking down fats and digesting carbohydrates, proteins, and fats.
Explanation:Bile and Digestive Juices in the Small IntestineThe bile produced by the liver and the digestive juices from the pancreas enter the duodenum, which is the first section of the small intestine. Bile helps in breaking down fats into smaller droplets to allow for easier digestion and absorption while the pancreatic juices contain enzymes that aid in the digestion of carbohydrates, proteins, and fats.
After food passes through the stomach, it moves into the duodenum where it combines with the bile from the liver and digestive juices from the pancreas. These substances work together to continue the process of digestion started in the stomach.
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For your internship at the local zoo, you have been assigned to help with the new orangutan-breeding program. Little is known about orangutan reproductive hormones, but hormone feedback cycles are often the same in closely related animals. You have been asked to use your knowledge of the interactions of human reproductive hormones to recommend injections to promote ovulation in a female orangutan when a visiting male arrives for a brief breeding visit.
Refer to the paragraph on the orangutan breeding program. Which of the following hormones would you use if you want to induce ovulation right away?
vasopressin, LH, estradiol, progesterone, or testosterone?
Answer:
luteinizing hormone (LH) is mainly used to induce ovulation.
Explanation:
Ovulation refers to the release of an egg.During menstruation ovarian follicle discharges an egg.The egg is also known as an ovum, oocyte, or female gamete. It is only released on reaching maturity.
Ovulation induction uses hormonal therapy to stimulate egg development and release egg or ovulate.
By increasing the production of follicle stimulating hormone (FSH) by the pituitary gland, follicles are stimulated and hence egg growth is seen.
A surge in the Luteinizing hormone (LH) causes the egg to release or ovulate. Luteinizing hormone (LH) is produced and released in the anterior pituitary gland. This hormone is a gonadotrophic hormone and plays an important role in controlling the function of ovaries in females and testes in males.
In women, the hormone stimulates the ovaries to produce oestradiol. Two weeks into a woman's cycle, a surge in luteinizing hormone causes the ovaries to release an egg during ovulation. If fertilization occurs, luteinizing hormone will stimulate the corpus luteum, which produces progesterone to sustain the pregnancy.
What are the most abundant animals found in the pelagic zone
Answer:
Zooplankton
Explanation:
They are considered to be the most abundant in this particular zone.
Imagine you are a following the path of an oxygen molecule into the body. List the following structures in the correct order that the oxygen molecule would travel through them. Start with where oxygen would enter the body and end the location at which oxygen would enter the blood. TRACHEA, LARYNX, ALVEOLUS, BRONCHIOLE, PULMONARY CAPILLARY, NASAL CAVITY, PHARYNX, and BRONCHUS.
The correct order that an oxygen molecule would travel through the structures of the lower respiratory system is: Nasal Cavity, Pharynx, Larynx, Trachea, Bronchi, Bronchioles, Alveolus (Alveolar Sacs), Pulmonary Capillary.
Explanation:The correct order that an oxygen molecule would travel through the structures of the lower respiratory system is as follows:
Nasal CavityPharynxLarynxTracheaBronchiBronchiolesAlveolus (Alveolar Sacs)Pulmonary CapillaryWhen we breathe in, air enters the nasal cavity and then travels through the pharynx, larynx, trachea, bronchi, and bronchioles. The oxygen eventually reaches the alveoli, which are surrounded by capillary networks. It is at this point that gas exchange occurs and oxygen diffuses into the blood through the pulmonary capillaries.
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"The correct order in which an oxygen molecule would travel through the structures from entry into the body to entering the blood is as follows:
1. NASAL CAVITY
2. PHARYNX
3. LARYNX
4. TRACHEA
5. BRONCHUS
6. BRONCHIOLE
7. ALVEOLUS
8. PULMONARY CAPILLARY
Here is the explanation and logic for the
1. NASAL CAVITY: The journey of an oxygen molecule begins here, where air is inhaled through the nose. The nasal cavity warms, humidifies, and filters the air.
2. PHARYNX: After passing through the nasal cavity, the air enters the pharynx, which is a passageway leading to both the esophagus and the larynx.
3. LARYNX: The air then moves into the larynx, also known as the voice box, which serves as a passageway for air and also contains the vocal cords for sound production.
4. TRACHEA: From the larynx, the air proceeds into the trachea, or windpipe, which is a tube reinforced by cartilage rings that keeps it open for airflow.
5. BRONCHUS: The trachea divides into two main bronchi, one leading to each lung. These are the primary conduits for air into the lungs.
6. BRONCHIOLE: The bronchi further divide into smaller tubes called bronchioles, which deliver air to the alveoli.
7. ALVEOLUS: The bronchioles end in tiny air sacs called alveoli, where the exchange of oxygen and carbon dioxide occurs. This is the site of gas exchange between the air in the alveoli and the blood in the capillaries.
8. PULMONARY CAPILLARY: Finally, the oxygen molecule diffuses across the thin walls of the alveoli into the pulmonary capillaries, where it binds to hemoglobin in red blood cells to be transported throughout the body.
This sequence represents the pathway of oxygen from the external environment to the bloodstream, where it can be distributed to tissues and cells for cellular respiration."
4. Which of the following radioactive isotopes takes the longest to decay: Carbon-14, Potassium-40, Uranium-238 or
Rubidium, 87?
Answer:
Rubidium 87
Explanation:
Final answer:
Rubidium-87 is the radioactive isotope with the longest half-life of 48.8 billion years, taking the longest to decay compared to Carbon-14, Potassium-40, and Uranium-238, which have half-lives of 5,730 years, 1.25 billion years, and 4.5 billion years, respectively.
Explanation:
The radioactive isotope that takes the longest to decay among Carbon-14, Potassium-40, Uranium-238, and Rubidium-87 is Rubidium-87. While Carbon-14 has a relatively short half-life of 5,730 years, and is used for dating relatively recent remains, Potassium-40 has a longer half-life of 1.25 billion years. Uranium-238 has a half-life of 4.5 billion years. However, the longest half-life belongs to Rubidium-87, which decays into Strontium-87 over a staggering 48.8 billion years, making it the isotope that takes the longest to decay of those listed. This extreme longevity allows Rubidium-87 to be used for dating the oldest rocks and for finding the minimum age of the Earth.
A bird flew and landed on its swing. When the bird "hit" the swing, the swing began to move back and forth. What happened when the bird landed on the swing?
A. Energy was transferred from the air to the swing.
B. The swing and the bird gained energy.
C. The swing's energy and the bird's energy each stayed the same.
D. Some of the bird's energy was transferred to the swing.
Answer:
D. Some of the bird's energy was transferred to the swing.
Why is it so difficult to tell the impact of pollution in the deep ocean region?
cause it's so deep in the ocean
Berkowitz and LePage (1967) found that frustrated men delivered more shocks when:_____
a. they were initially depressed.
b. badminton racquets happened to be in the room.
c. they had just received a shot that lowered their serotonin levels.
d. guns happened to be in the room.
Answer: d. guns happened to be in the room.
Explanation:
The weapon effect theory is a theory of social psychology. It suggests that mere presence of weapon or its picture can lead to aggressive behavior or may produce shock in human participants.
This theory was demonstrated by the Leonard Berkowitz and Anthony LePage in 1967. These researchers selected 100 male university students for one laboratory session.
These were randomly assigned to receive one or seven shocks. These shocks generated by the weapon those were kept on the laboratory and were related to belong to one of the peer. This will may generate mental shock among the students.
which eukaryotic cell is filled with a solution of water and nutrients called_________ inside of which is sort of scaffolding called the_______
Answer:
Your answers are CYTOPLASM and CYTOSKELETON.
In the process of carbon fixation, three molecules of RuBP combine with three molecules of CO2 to produce three six-carbon molecules, which are then split to produce 12 molecules of 3-phosphoglycerate. After phosphorylation and reduction produce 12 glyceraldehyde 3-phosphate (G3P), what more needs to happen to complete the Calvin cycle?
The study of plants is called botany.
The correct answer to the following question is regeneration.
What is the Calvin cycle?The formation of food in the presence of sunlight in a few plant species is called the Calvin cycle.Steps involve the Calvin cycle?CarboxylationReductionEndothermic repetitionRegeneration
After the process of carbon fixation, three molecules of RuBP combine with three molecules of CO2 to produce three six-carbon molecules, which are then split to produce 12 molecules of 3-phosphoglycerate. After phosphorylation and reduction produce 12 glyceraldehyde 3-phosphate (G3P)
The RUBP compound released from the G3P compound to start the cycle again as the primary acceptor of the carbon dioxide is RUBP which makes the First stable compound.
Hence, the correct answer is regeneration.
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Gluconeogenesis shares some, but not all, enzymes with the glycolytic pathway. It would appear to be more efficient if both pathways used all of the same enzymes since the pathways are essentially the reverses of each other. Why don't both pathways use all of the same enzymes?
A) The reactions where enzymes differ occur in different parts of the cell for glycolysis versus gluconeogenesis.
B) Enzymes can catalyze a reaction only in one direction, so naturally the two pathways have some enzymes that differ.
C) In tissues where gluconeogenesis occurs, the glycolytic enzymes are present at extremely low concentrations.
D) Three of the reaction steps in gluconeogenesis would have prohibitively large, positive free energies if they used glycolytic enzymes for their catalysis.
Answer:
D) Three of the reaction steps in gluconeogenesis would have prohibitively large, positive free energies if they used glycolytic enzymes for their catalysis.
Explanation:
The glycolytic enzymes catalyze the conversion of glucose to pyruvate, while gluconeogenesis enzymes catalyze the formation of carbohydrates from pyruvate.
The leaves at the top of a tree’s canopy are exposed to direct sunlight during the day, and their phytochromes will occur in a high _____ ratio. Meanwhile, the leaves of the same tree at the bottom of the canopy are highly shaded during the day and will likely have a higher proportion of the _____ form of phytochrome present due to exposure to a higher proportion of _____ light.
Answer:
Explanation:
1)Pfr/Pr
2) Pr
3)far-red
Explanation:
The leaves at the top of a tree’s canopy are exposed to direct sunlight during the day, and their phytochromes will occur in a high *Pfr/Pr* ratio. Meanwhile, the leaves of the same tree at the bottom of the canopy are highly shaded during the day and will likely have a higher proportion of the * ( PHYTOCHROME )Pr *;form of phytochrome present due to exposure to a higher proportion of *FAR RED * light.
Plants make use of the phytochrome system to it's adjust growth based on the seasons. Through phytochrome plants is able to respond to the timing and duration of dark and light periods. At dawn, all the phytochrome molecules present in the leaved are converted to the active Pfr form until sunset this is because the sun is unfiltered, and unfiltered sunlight has high percentage of red light, but lower far-red light, with the help of phytochrome system , the plants is able to compare the length of dark periods over several days.
The leaves at the top of a tree's canopy are exposed to direct sunlight during the day, and their phytochromes will occur in a high Pfr/Pr ratio. Meanwhile, the leaves of the same tree at the bottom of the canopy are highly shaded during the day and will likely have a higher proportion of the Pr form of phytochrome present due to exposure to a higher proportion of far-red light.
Unfiltered sunlight is rich in red light which activates the Pfr form, promoting growth towards light. However, shaded leaves receive far-red-enriched light, converting phytochrome to the Pr form, which slows down growth. Therefore, the evolutionary advantages of the phytochrome system are substantial, helping plants grow away from shade and towards light, a crucial factor in dense plant communities where competition for light is intense.
In studying fossils at a particular location, biologists found an insect in a layer of shale, a flower in a layer of sandstone, a fish in a layer of limestone, a reptile in a layer of shale, and a bird in a layer of limestone. The insect probably lived at the same time as the:_________.
1) fish.
2) bird.
3) flower.
4) reptile.
Answer:
4) reptile.Explanation:
Such type of the trace of living things that were existed in past or preserved remains of the living organisms are called fossils. Generally bones, exoskeleton and some other parts are found during the geographical study. These fossils are used for various experimental purposes such as in the study of the evolution of the organisms and some other. Shale is made up of weathering rock and is present in thin layers and contains different types of fossils record of the organisms for many years. Fossils of reptiles and insects were found at the same time.
A researcher who detects a higher-than-normal amount of interferon in a laboratory rat would correctly conclude that a.the rat has, or recently had, a viral infection. b.cancerous cells are present in the rat. c.the rat's diet is deficient in calcium.d.monocytes are differentiation into macrophages in the rat's bloodstream.
Answer: I don’t know
Explanation:
Which of the answer choices correctly lists the three forms of nitrogenous waste in order from least to most toxic? uric acid, ammonia, urea urea, ammonia, uric acid ammonia, urea, uric acid urea, uric acid, ammonia uric acid, urea, ammonia
Answer:
uric acid < urea < ammoniaExplanation:
Such types of metabolic wastes that contain nitrogen are called nitrogenous wastes such as ammonia, urea, and some other. The formation of these waste materials are based on the nature of the organisms such as urea and uric acid are the common nitrogenous waste of the terrestrial organisms. Ammonia is generally produced in freshwater fishes and some other marine organisms. Since ammonia requires a sufficient amount of the water to excrete out so aquatic organisms excrete this wastes. Ammonia is more soluble in water has the highest toxic nature than other nitrogenous wastes. The organisms that produce ammonia as waste products are called ammonotelic organisms such as fishes, protozoans, and some other aquatic organisms. The organisms that produce urea as waste material are known as ureotelic such as mammals and some other. Urea has a less toxic effect than the ammonia molecule. Uricotelics are those organisms that excrete uric acid as nitrogenous waste such as birds, reptiles and some other. Uric acid is the least toxic in comparison to urea and ammonia.a sample of wood that originally contain 10 g of carbon-14 Now contains only 50 g of carbon 14 approximately how many years ago was the sample apart of living tree
Answer:
5,700 years
Explanation:
Identify some geographical barriers that could separate populations.
Answer:
Oceans, lakes, any large bodies of water.
Explanation:
In terms of country populations, oceans separate the different populations from each other.
Which antivenom will save
Tyler?
Answer: Anticenom D
Explanation
The snake that bit Tyler is
= most closely related to a
tiger snake. Tyler needed
antivenom D but now it's too
latel Venoms from similar
snake species tend to be
Ealike so the same
Tyler will be saved by Antivenom D.
What do you mean by Antivenom?
Antivenom may be defined as a form of antibodies that are synthesized in animals by injecting a small amount of venom.
Antivenoms commonly function by stimulating your immune response after a specific type of snake bite.
Therefore, Tyler will be rescued by Antivenom D.
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A disease caused the population of small planktivorous fish in the region to sharply decline. How will this situation affect the competition for food in the region? Consider direct and indirect effects.
This situation would lead to increase in price of this kind of food and increase in demand of other close substitutes.
Explanation:
With the decrease in the small planktivorous fish in the region would definitely affect the situation of food in that region because the demand would be high but the supply would be less. Thus the price of this kind of fish will increase.
The other effects of this situation would be increase in the demand of the other close substitutes of this kind of fish in this region for the consumption of the people.
Answer:
The zooplankton population may rise because the small planktivorous fish eat them for food. There also may be more phytoplankton for bivalves and small invertebrates because there will be less competition for these food resources from small planktivorous fish. But gulls, terns, large fish, and wading birds will have much more competition for food, both interspecific and intraspecific. This competition can indirectly affect the food supply for large carnivorous birds, such as bald eagles and ospreys. If the large fish don’t have enough food to survive, their populations may also decline, which will decrease the food supply for these larger carnivores.
Explanation:
answer from Plato
* Required 1. The stems and fruits of pineapple plants contain a group of protein-digesting enzymes collectively called bromelain and often used as an antibrowning agent for fruits and vegetables. Fruits and vegetables brown when they are bruised during transport or sliced and exposed to air. This browning is controlled by enzymatic pathways that produce brown pigments. The browning of fruits and vegetables reduces the nutritional value of the food, so antibrowning agents such as bromelain are used. Identify the type of monomer of which this enzyme is composed.
Answer:
Bromelain is a group of sulfhydryl containing proteases. Each of these proteases is composed of amino acids, the building blocks of protein.
Explanation:
Bromelain:
Bromelain is not regarded as a single enzyme. It is a mixture of proteolytic enzymes as well as phosphatases, glucosidases, peroxidases, cellulases and glycoproteins. At first, bromalain was regarded as an enzyme mixture produced by pineapple plants (Ananas comosus) but now it is referred to as any protease extracted from the Bromeliaceae family.
Proteins are macromolecules composed of amino acid subunits or monomers. Amino acids, linked through peptide bonds, form the complex globular structures of enzymes.
Explain how this system maximizes glucose absorption from the intestinal lumen into the epithelial cells and from the epithelial cells into the blood.
Transport of glucose from the intestinal lumen into the blood. Activity of the Na+/K+ ATPase (green) in the basolateral surface membrane generates Na+ and K+ concentration gradients, and the K+ gradient generates an inside-negative membrane potential.
Explanation:
The Na+K+ ATPase uses the energy of ATP hydrolysis to move Na+ out of the epithelial cells lining the intestine and into the blood. The reduced concentration of Na+ inside the cell coupled with high Na+ inside the lumen of the intestine results in a driving force for the movement of Na+ into the cell.
The cotransporters in the membrane of the epithelial cell facing the intestine allow Na+ to enter only when accompanied by either glucose or one of the amino acids (each have their own set of co-transporters).
Glucose then moves into the blood through the permease in the membrane between the cell and the blood. Thus, ATP is used as an energy source to drive Na+ out of the cell, resulting in glucose transport from the intestine to the blood.
The digestive system maximizes absorption from the intestinal lumen into the epithelial cells and from the epithelial cells into the blood through the use of microvilli.
The lining of the intestines has specialized cells in order to maximize the absorption of nutrients. These epithelial cells absorb from the lumen and from the epithelial cells into the blood. The specializations are called microvilli.
The specialization present is in the form of microvilli, multiple prolongations of the exterior membrane that expand the surface area, allowing the cells to absorb nutrients over a larger area. This is the method used by the digestive system to maximize the absorption of glucose and other nutrients.
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As trees go into dormancy, it’s leaves change color.
What causes this change in color?
A.) the tree make extra chlorophyll
B.) the tree stops making chlorophyll
C.)the tree produces extra hormones
D.)the tree stops producing hormones
Answer: B. The tree stops making chlorophyll
Explanation: Chlorophyll is what makes the leaves turn and look green. If that stops appearing, the leaves change color. A good example of this is when the trees change color in the fall.
Answer:
B
Explanation:
a car traveling 65 mph is an example of its
Answer:
speed
Explanation:
mph=miles per hour, which indicates speed
7. You are stranded on an island covered in
vegetation. To escape, you decide to build
a raft out of layers of reeds and small
branches.
(a) Would it be better to line up the reeds in
each layer and tie them together, or to
crisscross them and weave them together?
(b) Would it be better to line up the reeds in each layer in the same direction as the layer below, or should the reeds in each layer point in different directions, explain.
A. Criss-cross them and tie them together
B. Your raft would hold up better if you made them almost on top of each other in different directions otherwise you face them in the same direction your sticks would just fall flat
how do you describe muscle insertion?
Answer:
Skeletal muscles are attached to bones on each end by tendons. The origin is the fixed attachment, while the insertion moves with contraction. The action, or particular movement of a muscle, can be described relative to the joint or the body part moved.
The insertion of the muscle is defined as that end of the muscle that attaches to the freely moving bone of its joint. To understand muscles and joint movements, there are four things to keep in mind:
Movement happens at joints, where one bone acts freely as the other remains relatively stationary.
The bones can and do switch roles depending on the action you're making and the position you're in, but such is knowledge is a bit more advanced. (The Pilates method takes advantage of this phenomenon in the design of exercises that work your "anti-gravity" muscles.)
That said, a brief example is the comparison between walking and bending over while in a standing position. Both use the same hip action — flexion — but when you walk, your leg is freely mobile. When you bend over at the hips, your pelvis is the bone that is performing the movement.
Muscle attachments are named with this in functionality mind, so the label is given to an insertion (one of the two types of attachments) generally includes a reference to the bone that does the moving most of the time. In our walking versus bending at the hip example above, we walk way more than we bend over at the hips. This means that some of the muscles that go from pelvis to thigh bone reflect the fact that the thigh bone is freely movable during walking. An example of this is the rectus femoris, that big bulky muscle that lives at the front of your thigh. The word "femoris" refers to your thigh bone.