The countercurrent exchange system found in fish gills maximizes gas exchange efficiency by:
A) producing rapid water flows across the gill surface.
B) allowing water and blood to come in direct contact to maximize oxygen exchange.
C) having a high concentration gradient of oxygen at the start of the capillaries.
D) maintaining a high concentration gradient of oxygen along the entire length of capillaries.
E) decreasing the oxygen content of the blood leaving the gill filaments.
Correct Answer:
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Q2: Which of the following animals have lungs
Q3: Parabronchi are characteristic of:
A) insects.
B) spiders.
C) mollusks.
D)
Q4: What is the approximate maximum thickness of
Q5: Sponges, hydras, flatworms, and many other small,
Q6: The process of gas exchange in parabronchi
Q7: In the process of organismic respiration:
A) oxygen
Q8: The ventilation of insect tracheal tubes is
Q9: In fish, blood flows in a direction
Q10: Figure 46-1 Q11: Mitochondria use respired oxygen as an electron
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