Heart plays the role of pumping blood. In fishes there are two chambers, in amphibians and reptiles (except crocodile) there are three chambers of heart, and in mammals there are four heart chambers.
Class | number of chambers |
Pisces (fish) | 2 |
Amphibians, reptiles | 3 |
Mammals, aves (birds) | 4 |
There are two atrium and two ventricles in mammalian heart. The oxygenated blood is completely separated from deoxygenated blood, which is necessary to provide oxygen for energy generation in mammals.
Thus, mammals have four (4) heart chambers.
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