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Lymphatic system , Blood circulation

From Online Sciences - December 21, 2017

The contraction of right side of the heart occurs at the same time of left side contraction , Therefore , the pumping of deoxygenated blood from the right ventricle and pumping of the oxygenated blood from the left ventricle , both take place at the same time , Blood circulation in man is divided into three main pathways which arePulmonary circulation , Systemic circulation & Hepatic portal circulation .

Pulmonary circulation

It starts from the right ventricle and ends at the left atrium , and it takes place as follows :

At the end of the circulation when the left atrium contracts , the blood will pass to the left ventricle through bicuspid valve .

Systemic circulation

It starts from the left ventricle and ends at the right atrium , as follows :

At the end of the circulation when the right atrium becomes filled with blood , its walls contract and the blood is formed to the right ventricle which becomes filled with the deoxygenated blood .

Note : The contraction of right side of the heart occurs at the same time of left side contraction , Therefore , the pumping of deoxygenated blood from the right ventricle and pumping of the oxygenated blood from the left ventricle , both take place at the same time .

Hepatic portal circulation

It starts from the blood capillaries of villi of the small intestine and ends by blood capillaries inside the liver , as follows :

Lymphatic system

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