CBSE Class 10 Answered

In humans, heart is important to pump the blood during circulation, so that blood can reach all parts of the body. It also keeps the oxygenated and deoxygenated blood separate. The right auricle receives deoxygenated blood from the anterior and posterior parts of the body. This blood then flows into right ventricle, from where it is taken to the lungs for oxygenation. The oxygenated blood is then taken to the left auricle, from where it passes to the left ventricle. The left ventricle contracts and pumps the blood to all the parts of the body

In humans, blood flows twice through the heart, during each cycle of passage through the body. Hence this type of circulation is called double circulation.

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