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Problem:

Question: What is a limitation of the fish circulatory system?

a. Blood is pumped to the gills with too high a blood pressure and this sometimes reverses the counter-current flow of blood and water across the gills

b. Blood that reaches the heart is O2-poor, so keeping the heart muscle itself well oxygenated can be a limitation for strenuous swimming c. Blood is pumped to the tail muscles with too low a blood pressure for extended muscular effort

d. O2-poor blood is not pumped directly from the heart to the gills

Please provide correct answer.

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Category:- Biology
Reference No.:- M91163078

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