Question

how does circulation occurs in amphibians and fishes

Answer 1

To make use of this oxygen, theamphibian circulatory system has to route blood to the skin's surface to pick up oxygen. ... 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.

Answer 2

In fish, the heart only has one atrium and one ventricle. The oxygen-depleted blood that returns from the body enters the atrium, and then the ventricle, and is then pumped out to the gills where the blood is oxygenated, and then it continues through the rest of the body.