Refer to the figure showing a countercurrent exchanger from a fish gill. 
The values in the figure represent percent saturation of O2.Based on the information provided, which statement is true?
A) Fluid flowing through A represents water and B represents blood.
B) Fluid flowing through B represents water and A represents blood.
C) The change in O2 levels is accomplished by transfer of hemoglobin from tube A to tube B.
D) The change in O2 levels is accomplished by transfer of hemoglobin from tube B to tube A.
E) The direction of flow in both tubes is from left to right.
Correct Answer:
Verified
Q17: The rate at which a gas diffuses
Q18: Refer to the figure showing a variety
Q19: The movement of O2 and CO2 between
Q20: Which statement about respiratory adaptations is true?
A)
Q21: Which feature characterizes the lungs of mammals?
A)
Q23: In the respiratory cycle of birds, air
Q24: Which of the following represents the
Q25: Refer to the figure showing the respiratory
Q26: The delicate gills of fishes are protected
Q27: The rate of gas exchange in mammals
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