Differential between single circulation and double circulation

Single circulation and double circulation are two types of circulatory systems found in animals. The main difference between these two types of circulatory systems is the number of circuits that the blood takes before it returns to the heart.

Single circulation

In a single circulation system, the blood flows through the heart only once in a complete circuit. It is found in animals like fish, which have a simple cardiovascular system. In this system, the blood flows from the heart to the gills where it gets oxygenated, and then it travels to the rest of the body before returning to the heart.

Double circulation

In a double circulation system, the blood flows through the heart twice in a complete circuit. It is found in animals like mammals, birds, and reptiles, which have a more complex cardiovascular system. In this system, oxygen-poor blood is pumped from the heart to the lungs where it gets oxygenated, and then it returns to the heart to be pumped out to the rest of the body, which requires oxygen. This system ensures that oxygen-rich blood is delivered to the body's organs and tissues, and oxygen-poor blood is transported to the lungs for oxygenation.

Summary

In summary, the main differences between single and double circulation are the number of circuits that the blood takes before it returns to the heart. In a single circulation system, the blood flows through the heart only once in a complete circuit, while in a double circulation system, the blood flows through the heart twice in a complete circuit.