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Describe double circulation of blood in human beings. Why is it necessary?
Double circulation – In humans, during each cycle of blood circulation, blood passes through the heart twice:
1) Deoxygenated blood from all parts of the body is pumped to the lungs.
2) Oxygenated blood to all parts of the body.
This is called double circulation.
Vena cava brings deoxygenated blood from all parts of the body into the right atrium (relax). The right atrium contracts and send this blood to the right ventricles (relax). After receiving blood right ventricle contracts and pumps deoxygenated blood into the pulmonary artery for taking it to the lungs. The pulmonary vein brings oxygenated blood from the lungs to the left atrium. The left atrium is relaxed while receiving blood from the lungs. The left atrium contracts and send this oxygenated blood into the left ventricle. The left ventricle is relaxed (expanded) while receiving blood. After receiving blood left ventricles contract and pump this blood to all parts of the body through the aorta.
The necessity of double circulation: Double circulation prevents the mixing of deoxygenated and oxygenated blood. This ensures a highly efficient supply of oxygen to all the parts of the body.
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