BIO202H5 Midterm: Countercurrent Exchange
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Which of the following statements about gas exchange in gills is false?
a.) water passes through the fish's mouth before passing over the gills | ||
b.) | water and blood move in the same direction across the gill | |
c.) | the oxygen concentration in the water is higher than in the gill at all points along the gill | |
d.) | each gill filaments is composed of hundreds or thousands of lamellae |