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Human Body
and the blood is shunted through the defect, from one side to the other (usually from left to right). Each side is again divided into an upper and a lower chamber with openings guided by one way valves. The heart, thus, has four clambers :
Right and left atria
Right and left ventricles.
Right atrium
Superior
venae cavac
Inferior
venac cavae
Tricusoid
valve Right
ventricle
Semilunar valve
Blood flow through the heart
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Pulmonary veins
Mitral valve
Left
ventricle
It is actually a dual action-pump-one to send the blood into the lungs and the other to push it out into the body.
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Semilunar valves
We generally speak of a circulatory system, but actually we have two separate systems viz. (i) Systemic Circulation-through the body, and (ii) Pulmonary Circulation-a circuit from the heart to the lungs and back again.
While the first supplies blood to all parts of the body, the second one is a short loop from the heart to the lungs. Both circuits begin and end in the heart, and there is no mixing between them.
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