A fish pumps __________ blood through its heart as does the __________ side of the bird and mammalian hearts.
A)oxygenated; right
B)oxygenated; left
C)oxygen-poor; right
D)oxygen-poor; left
E)mixed; left

Question

Quizplus · Accepted Answer

Fish have a single-loop circulatory system, where the blood is pumped from the heart to the gills for oxygenation and then to the rest of the body. The blood leaving the heart is oxygen-poor and returns to the heart oxygenated. Therefore, a fish pumps oxygen-poor blood through its heart as does the right side of the bird and mammalian hearts.

A Fish Pumps __________ Blood Through Its Heart as Does