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Question

 What does the term "double circulation" mean?
 


Solution

Blood flows twice in the heart before it completes one full round. The full round thus includes pulmonary and systemic circulation. In pulmonary circulation, blood enters the lungs through pulmonary arteries. Pulmonary veins collect the blood from the lungs and carry it back to the left atrium.
In the systemic circulation, blood from the left ventricle enters the aorta through which the blood is sent to the body parts. From the body parts, blood is collected by veins and sent back to the heart. Therefore, the blood circulation in the human body is called double circulation.


Biology
Concise Biology
Standard X

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