Blood enters the heart through two large veins – the posterior (inferior) and the anterior (superior) vena cava – carrying deoxygenated blood from the body into the right atrium. ... When the ventricle is full, the mitral valve shuts to prevent blood from flowing backwards into the atrium.
Deoxygenated blood flow from the superior vena cavae flows into the right atrium, from there it passes through the tricupsid valve (open) to the right ventricle where the pulmonary valve remains closed while the venticle flls up. When the tricupsid valve closes after filling, the pulmonary valve opens, this allows deoxygenated blood from the right vetricle to pump up through the pulmonary valve into the pulmonary artery and flows through the lungs to get oxygenated.
The oxygenated blood then goes through the pulmonary vein from the lungs into the left atrium which flows into the left ventricle through the mitral valve. When the ventricle is full, the mitral valve shuts to prevent blood from flowing backwards into the atrium. The oxygenated blood then leaves the heart through the aortic valve into the aorta and to the rest of the body where it supplies all organs. After the blood has passed through the capillary beds and the oxygen is depleted, the deoxygenated blood enters the venules, veins and goes back to the venae cavae that take blood back to the heart
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