What is incomplete double circulation?

Answer: Incomplete double circulation means a circulatory system in which blood enters the heart via two different routes but exits via a single route.

The heart seems to be three chambered in such cases. It consists of two auricles as well as one ventricle. As a result, deoxygenated and oxygenated blood mix. The left auricle obtains oxygenated blood through the lungs and the right auricle obtains deoxygenated blood through the body. However, in the ventricle, deoxygenated and oxygenated blood mix. The hearts of amphibians and reptiles have three chambers. As a result, both reptiles and amphibians exhibit incomplete double circulation.