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Regulation of pulmonary blood flow
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The pulmonary arteries divide into smaller arteries known as pulmonary arterioles and then eventually into pulmonary capillaries which surround the alveoli - which are the millions of tiny air sacs where gas exchange happens.
The pulmonary capillaries drain into small veins that join to form the two pulmonary veins exiting each lung, and these pulmonary veins complete the circuit by delivering oxygen-rich blood into the left atrium.
Pulmonary blood flow refers to the flow of blood through the lungs, and reflects the cardiac output of the right ventricle. Pulmonary blood flow (Q) is directly proportional to the difference in pressure between the pulmonary artery and the left atrium (the delta P); and inversely proportional to the resistance of the pulmonary vasculature (R). Q=ΔP/R
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