Double Circulation of Blood in Human Beings

Double circulation of blood refers to the circulation of blood in two separate pathways in the human body. The two pathways are the pulmonary circulation and systemic circulation. The pulmonary circulation is the pathway that circulates blood between the heart and the lungs, while the systemic circulation is the pathway that circulates blood throughout the rest of the body.

Necessity of Double Circulation of Blood

Double circulation of blood is necessary in human beings because:

1. Efficient Gas Exchange: The pulmonary circulation allows for efficient gas exchange between the lungs and the heart. Blood that is low in oxygen is transported from the heart to the lungs, where it picks up oxygen and releases carbon dioxide. This oxygen-rich blood is then transported back to the heart for distribution to the rest of the body.

2. Efficient Nutrient and Waste Exchange: The systemic circulation allows for efficient exchange of nutrients and wastes between the body tissues and the heart. Oxygenated blood is transported from the heart to the body tissues, where it delivers oxygen and nutrients. Deoxygenated blood that is rich in carbon dioxide and other wastes is then transported back to the heart for elimination.

3. Separation of Oxygenated and Deoxygenated Blood: Double circulation ensures that oxygenated blood does not mix with deoxygenated blood. This separation of blood allows for efficient delivery of oxygen to the body tissues and effective removal of carbon dioxide and other wastes.

4. Efficient Blood Pressure Regulation: Double circulation allows for efficient regulation of blood pressure. The pulmonary circulation has a lower pressure system compared to the systemic circulation, which has a higher pressure system. This allows for efficient distribution of blood flow to all the body tissues.

In conclusion, double circulation of blood is necessary for efficient gas exchange, nutrient and waste exchange, separation of oxygenated and deoxygenated blood, and efficient blood pressure regulation.