Question

Blood passes only once through heart of the fish why

Answer 1

Blood goes only one time through the heart of the fish during one cycle because fishes have two chambered heart, the blood is passed to the gills for oxygenation from where it passed directly to the other parts of the body. 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.