how many times did your pointer touch body in single/double circulation?
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It is called a double circulatory system because it has two loops, one from the heart to the lungs and one from the heart to the rest of the body. The advantage of a double circulatory system is that blood can be pumped to the rest of the body at a higher pressure.
The other circulation is from the left ventricle to the entire systemic circulation and back to the right atrium. Thus, considering that the heart beats 72 times in a minute, the blood goes through these double circulation 72 times.
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