The pulmonary arteries which basically carry blood from right ventricle to lungs is called pulmonary circuit. In pulmonary arteries along with pulmonary veins and pulmonary capillaries, gases take place. This circuit also carries the blood to the left atrium. Starting from the right ventricle, the pulmonary circuit ends at the left atrium. Here oxygen-poor and carbon dioxide-rich blood comes back into the body and enter in the right atrium. The blood later goes into right ventricle via the pulmonary truck. The four chambered heart then pumps into the lungs via the pulmonary truck. Basically it performs two main functions. First is to supply the blood to the lungs and second is to enrich oxygen.
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This circuit delivers blood to the capillary beds. This circuit is slightly complex than pulmonary circuit. When heart circulates blood into the body, the left atrium receives blood from systematic veins. The right atrium pumps oxygenated blood into half of the heart. It is also important to mention that systematic circuit has most of the blood volume which is almost 84% of the total blood. The systematic circuit starts at the left ventricle and ends in the right atrium. When heart pumps into body tissues and then comes back is also called systematic circuit. This circuit is quite long and considered longer than the pulmonary circuit. All the arteries of pulmonary circuit carry oxygenated blood. The left side of heart which is also called systematic circuit spreads oxygenated blood into body.
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