If there is Incomplete blood circulation in Amphibians and reptiles then how do their blood gets purified?

Dear student

The amphibians and reptiles have an intermediate three-chambered heart.This leads to the incomplete double circulation in them. Oxygenated blood from lungs is received by the left atrium of the heart and deoxygenated blood is received by the right atrium of the heart. But, both the blood gets mixed up due to the presence of single ventricle. This pumps out the mixed blood. Thus, blood comes through the heart by two different routes and leave the heart by a single route.
 

Fishes, amphibians and many reptiles are cold blooded animals. The body temperature of cold-blooded animals is the same as that of their surroundings. In hot environments, their blood becomes warm and in colder environments, their blood becomes cold.

Therefore, they do not require energy to maintain their body temperature. Hence, cold-blooded animals such as fishes, amphibians, and many reptiles can tolerate some amount of mixing of oxygenated and deoxygenated blood. Therefore, they have two or three chambered hearts.

Thus, blood is purified in the lungs and little amount of exchange of gases occurs through skin also. There is a mixing of blood but it does not affect them.

Regards

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