Which statement is true about reptile and amphibian circulatory systems relative to other vertebrates? A)the hydrostatic pressure drops after passing through the lung, resulting in a slow flow of oxygenated blood to the systemic circuit B)the blood has to travel through only two chambers instead of the four of most other vertebrates c)the oxygenated and deoxygenated blood mixes in a common ventricle before being pumped to both the pulmonary and systemic circuit d)the vessels occasionally open into sinuses where blood mixes with other reservoirs of fluid, dropping the hydrostatic pressure and slowing the pace of oxygen delivery
Added by Christopher C.
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B) This statement is not entirely accurate, as most reptiles have three-chambered hearts, while amphibians have three-chambered hearts as well. It is true that they have fewer chambers than the four-chambered hearts of mammals and birds, but the statement is not Show more…
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Which of the statements is accurate? a) Diving reptiles can alter the pattern of blood circulation to bypass their lungs when submerged. b) Amphibians and most reptiles have a four-chambered heart consisting of two atria and one ventricle. c) Amphibians only respire through their lungs. d) There is a complete separation of pulmonary and systemic circulation in amphibians and most reptiles.
Adi S.
Most vertebrates that live on land have two circuits for blood with relatively separate pathways through the heart. One pathway, called the systemic circuit, leaves the heart and travels to all the parts of the body and then back to the heart. The second, called the pulmonary circuit, travels from the heart to the lungs and back. However, the amphibian heart is almost like an inline pump that mixes blood from both circuits. Which statement below best describes why this setup works in amphibians? A. because the skin and lung surface are both respiratory membranes, so blood in both circuits replenish the oxygen supply B. because the amphibian lives some of its life in water, which has less oxygen than the air C. because the larvae of amphibians use gills to carry out respiration D. because amphibians have a low metabolism and the heart has to spend less energy to pump if there are fewer chambers
John N.
Which of the following is not a true statement about open and closed circulatory systems? a. Both systems have some sort of a heart that pumps a circulatory fluid through the body. b. A frog has an open circulatory system; other vertebrates have closed circulatory systems. c. The blood and interstitial fluid are separate in a closed system but are indistinguishable in an open system. d. Some of the circulation of blood in both systems results from body movements.
Sri K.
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