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The right atrium receives deoxygenated blood through the vena cava, which are large veins. This initiates the pulmonary circuit, in which the right atrium pumps blood that has lost oxygen to the right ventricle via the tricuspid valve.
What are the steps involved in circulation of blood in humans ?
Blood is ejected from the right ventricle into the pulmonary arteries by contracting and passing through the pulmonary semilunar valve. The pulmonary arteries travel to the capillary beds that line the lungs' alveoli, where the blood loses its carbon dioxide and picks up oxygen. The pulmonary circuit is finished and the systemic circuit is initiated as the oxygenated blood travels through the pulmonary veins back to the left atrium.
Blood is pumped from the left atrium into the left ventricle through the bicuspid/mitral valve. The aortic semilunar valve opens when the left ventricle contracts, ejecting oxygenated blood into the aorta. The aorta divides into smaller arteries, then into even tiny arterioles, and finally into many capillaries. Here, there is a gas exchange where oxygen is given to the tissue and carbon dioxide is taken up by the tissue. Before returning to the vena cava, the deoxygenated blood travels through veins and venules. Thus, the systemic circuit is finished.
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Describe the flow of blood through the heart by placing the following structures in order. Begin and end with the vena cava. Also, identify whether the blood is oxygenated or deoxygenated.
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