Question

What are the various organs of the blood circulatory system in humans? Describe the circulation of blood in the human body with the help of a flowchart. Why is the blood circulatory system in humans called a "double circulation"?

Answer 1

The circulatory system consists of the following organs - four-chambered heart, a network of branching blood vessels and blood.
The blood vessels are of three types - veins, arteries and capillaries.

Double circulation is the process of passing blood twice through the heart in one cycle. It occurs in bigger organisms like mammals and birds requiring more metabolic energy.

The four-chambered heart in humans contains two auricles (left and right) and two ventricles (left and right). The left part of the heart contains oxygenated blood and the right part of the heart contains deoxygenated blood. Thus, blood passes two times in one complete circuit—one with oxygenated blood and the other with deoxygenated blood. This is double circulation. The double circulation system prevents the mixing of oxygenated and deoxygenated blood.