Circulatory System of Man
It consists of heart, arteries, veins and capillaries, Mammals. Birds and Crocodiles have a double circulation made up of the pulmonary circulation between the heart and the lungs and the systemic between all other parts of the body.
In human the heart pumps bloods into narrower ducts called Capillaries. Eventually capillaries join together forming small veins called venules and these led into larger and larger veins; which carry blood back to the heart.
The aorta is the largest and longest artery in the body. it receives blood from the left ventricle of the heart and branches from it lead to all organs and tissues except the lungs.
The pulmonary artery carries blood from the right ventricle to the lungs. The heart-beat consists of 2 phases systole and diastole.
In systole the ventricles contract and force blood along the aorta and pulmonary artery.
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