The blood flows through the heart in the following manner:
The deoxygenated blood reaches the heart through two major veins - (a) the superior venacava and (b) the inferior venacava. The superior
venacava brings back "impure" or deoxygenated blood from cells or
tissues of the upper part of the
body and the inferior venacava
brings deoxygenated blood from cells or tissues of the lower part of the body. Both drain this blood into the right atrium
of the heart. The blood from the right
atrium then enters into the right
ventricle, through tricuspid valve.
It then goes to lungs through pulmonary arteries for oxygenation. The
oxygenated blood then re-enters the heart at the left atrium through pulmonary veins. From left atrium it
goes to left ventricle, through bicuspid
or mitral valve. It finally comes out of the heart, through aorta and its branches, which supply
this oxygenated blood to the rest of the body
The heart supplies blood to all parts of the body, but it in
turn is supplied by the coronary
arteries and veins, a branch of aorta.
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