The circulatory system consists of one heart, five liters of blood, and approximately 96,000 kilometers of blood vessels, responsible for transporting nutrients and waste throughout the body.

Even when our body is at rest, our tissues require a certain rate of blood circulation. During exercise or times when greater demands are placed on the body, blood circulation must increase.

Now, before describing the circulation of blood in the human body it is necessary to know more about arteries, veins and capillaries. Arteries are thick walled blood vessels which carry blood from ...

All the blood vessels in the human body lined up end-to-end would stretch about 100,000 kilometers. That's about two and a half times the earth's circumference.

In the human body, blood does not merely flow to and from one organ at a time. It circulates through various organs, transporting nutrients, drugs, signaling proteins, and metabolites from one ...

Blood circulation, as is now understood, is a double system. There is a circuit through the body (the systemic circulation) as well as one through the lungs (the pulmonary circulation).

See how the human heart moves blood through the body in this animated feature from the NOVA: ... Even when our body is at rest, our tissues require a certain rate of blood circulation.