B. Reptiles C. Fish D. Birds E. Mammals 12. Counter-current flow is important in
ID: 272695 • Letter: B
Question
B. Reptiles C. Fish D. Birds E. Mammals 12. Counter-current flow is important in A. maintaining the hypertonicity of the medulla of the vertebrate kidney maintaining a maximal oxygen extraction by the fish gill. C. keeping the tuna's swimming muscles warmer than the surrounding water D preventing a duck from losing large amounts of heat through its feet when weather is cold. E. all of the above are true. 80 A. amount of oxygen used by the tissues at rest. 50 B. oxygen concentration of blood in the tissues during exercise. C. oxygen concentration in the lungs. D. oxygen concentration of blood in the 20 tissues at rest E. amount of oxygen used by the tissues during exercise. 20 4 100 12 140 b. According to the figure, approximately Partial Pressure of O2 (mmHg) how much oxygen is removed from the blood as it passes through the tissues at rest? A. 15 mL 0/100 ml of blood B. 10 mL O,/100 ml of blood C. 5 mL. O/100 ml of blood D. 10 mL 0g E. 5 mL O/g C. During exercise, the body supplies O, to the muscles by A. increasing blood flow B. increasing muscle fiber declination. C. unloading more O, to tissues from hemoglobin. D. Both a and c E. All of the above d, According to the figure below, which of l blood 10 the statements below is the most A. 02 concentrations of arterial blood are inversely proportional to swimming speed. B. As O2 concentrations of blood drop 88 C. Hypoxia-adapted fish have a muchE D. As swimming speed increases, the in venous blood, wimming speed Venous blood 2 lower saturation level during exercise than other fish do. Rest 50 60 70 80 90 100 arterial blood remains nearly saturated while the venous blood decreases in saturation. Swimming speed (% maximum) E. Cold-acclimated fish have a much lower saturation level during exercise than other fish do. 17. The key enzyme involved in the formation of bicarbonate from CO, is A. lactateExplanation / Answer
Q.12
Answer: Option E
Explanation:
Counter-current oxygen exchange is used by fish to extract maximum amount of oxygen from water.
Counter-current multiplication takes place in kidney to produce hyperosmotic urine.
Counter-current heat exchanger is involved in thermoregulation. This is the reason that tuna's muscle is warmer when compared to the surrounding water and the duck's feet does not lose heat during cold weather.
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