Blood enters the right atrium from systemic circulation via the IVC and SVC , Blood goes through the R. AV valve (tricuspid) to the right ventricle, Blood goes through the pulmonary semilunar valve to the pulmonary trunk, Blood goes through the pulmonary arteries to the lungs to exchange CO2 and O2, This is the pulmonary circulation, The bloods goes through 4 pulmonary veins to the left atrium, The blood goes through the mitral (bicuspid) valve to the left ventricle, The blood goes through the aortic valve to the aorta , The blood goes everywhere in the body except the lungs, This is systemic circulation,

blood flow

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