At any given point along the length of the gill lamella, how does the pO2 of the blood flowing through the blood vessels in the lamella compare to the pO2 of the water flowing over the gill lamella?
A. The pO2 of the blood is lower than the
pO2 of the water.
B. The pO2 of the blood is higher than the
pO2 of the water.
C. The partial pressure of oxygen in the blood
is equal to the pO2 of the water.
D. The pO2 of the blood is variable and
cannot be compared to the pO2 of the water.
E. The pO2 of the blood never exceeds 50%
of the pO2 of the water.
A
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