7. Write a short note on the following:
a) Circulation in fishes
b) Circulation in reptiles and amphibians
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In fish, the system has only one circuit, with the blood being pumped through the capillaries of the gills and on to the capillaries of the body tissues. This is known as single cycle circulation. ... Fish have a closed-loop circulatory system. The heart pumps the blood in a single loop throughout the body
Amphibians have a double circulatory system composed of two circuits. The systemic circuit circulates blood between the heart and the rest of the body, and the pulmocutaneous circuit circulates blood between the heart and the lungs and skin.
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