EVERYDAY SCIENCE

Detailed explanation-1: -Reptiles generally have a three-chambered heart, while crocodile is an exception with a four-chambered heart. There are two atrium and two ventricles in the heart forming the four chambers.

Detailed explanation-2: -Most reptiles have two atria and one ventricle. The only exceptions are the 23 living species of crocodilians (alligators, caimans, crocodiles and gharials) who, like birds and mammals, have four-chambered hearts with two atria and two ventricles (Jones, 1996; Jensen et al., 2014).

Detailed explanation-3: -Reptile hearts have three chambers, two atria and one ventricle (Figure 1). The exception is crocodilians, which have four-chambered hearts, just like mammals and birds.

Detailed explanation-4: -Four chambered heart is found in the reptile crocodile. Although reptiles show three-chambered hearts generally. Thus, the crocodile is an exception to it. It carries two auricles and two ventricles, just like mammals.

Detailed explanation-5: -With the exception of crocodiles, which have a four-chambered heart, all reptiles have a three-chambered heart with two atria and one ventricle. The right atrium receives deoxygenated blood.