Ectothermic reptiles can shunt blood past the lungs when not breathing. constrict pulmonary vessels when breathing. have continuously high metabolic demands. have greater resistance in the pulmonary circuit than in the systemic circuit when breathing. have a partially divided atrium.
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6. Lung ventilation in reptiles, as exhibited by the crocodilians, involves a movement of the ribs. 7. The anterior region of the elongated lung in rear-fanged snakes is compartmentalized and highly vascularized, whereas the posterior region is a simple sac that is poorly vascularized. This adaptation allows rear-fanged snakes to simultaneously strike prey and exchange gases (O2, CO2). 8. In reptilian hearts, the atrium is completely divided into left and right atria. The reptilian heart ventricle is: a. also completely divided. b. partially divided. c. completely divided only in the crocodilians. d. partially divided in turtles, lizards, and snakes. e. both c & d. 9. In the partially divided ventricle of a reptilian heart, oxygen-rich blood entering from the left atrium partially mixes with oxygen-poor blood entering from the right atrium. The configuration of the heart and vessels combined with the contraction of the ventricle sends: a. blood with the highest oxygen content to the right systemic artery (blood to head). c. blood with low oxygen content to the pulmonary artery (blood to lungs). d. all of the above. e. both a & c. 10. When a marine iguana forages underwater, they conserve oxygen and extend their dive time by: a. shunting blood from the right side of the heart to the left side, bypassing the pulmonary artery. c. lowering heart rate. d. lowering metabolic rates. e. only b and c.
Madhur L.
how can aquatic reptiles undergo right to left cardiac shunting ?
Adi S.
When a reptile, such as a sea turtle , dives: a. a right to left shunt of blood flow occurs at the heart, bypassing the lungs b. pulmonary perfusion increases due to an increase in pressure c. Metabolites increase systemically thus stimulating cutaneous gas exchange d. No accommodation occurs in the cardiovascular system
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