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.
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This allows them to conserve oxygen and stay underwater for extended periods. Show more…
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Adi S.
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
Which of the following is a correct description of the amphibian heart? a. In the amphibian heart, oxygenated and deoxygenated blood mix completely in the single ventricle. b. In the amphibian heart, there are two SA nodes so that contractions occur simultaneously throughout the heart. c. In the ventricle in the amphibian heart, internal channels reduce mixing of blood. d. In the amphibian heart, only the left aorta pumps oxygen obtained by diffusion through the skin.
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