![]() ![]() However, there is a hole in the crocodile chamber wall, so whether there are three or four heart chambers is up for debate. The exception is crocodilians, which have four-chambered hearts, just like mammals and birds. ![]() Reptile hearts have three chambers, two atria and one ventricle ( Figure 1). Later, the chick heart will become four-chambered, with two atria and two ventricles. The chick is young and therefore only has one ventricle and one atrium. Microscope images of the heart muscle of a chick (B) and a dog (C) are also shown. The giraffe’s right ventricle is smaller, as it only pumps blood to the lungs. ![]()
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