The blood vascular system of mammals is known | vedclass

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(D) The blood vascular system of mammals is called a double circulatory system because blood passes through the heart twice for every one complete cyc

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Blood passes through the heart twice in each complete cycle of the body.

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(D) The blood vascular system of mammals is called a double circulatory system because blood passes through the heart twice for every one complete cycle of the body. This involves two distinct circuits: $1$. Pulmonary circulation: Deoxygenated blood is pumped from the right ventricle to the lungs for oxygenation and returns to the left atrium. $2$. Systemic circulation: Oxygenated blood is pumped from the left ventricle to all body tissues and returns as deoxygenated blood to the right atrium. Since the blood flows through the heart twice,it is termed double circulation.

The blood vascular system of mammals is known as a double circulatory system because

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