Blood leaving the lungs is rich in:

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(A) During the process of respiration,deoxygenated blood is pumped from the heart to the lungs via the pulmonary artery.In the lungs,gas exchange occu

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Oxygen

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(A) During the process of respiration,deoxygenated blood is pumped from the heart to the lungs via the pulmonary artery.In the lungs,gas exchange occurs at the level of the alveoli.Oxygen diffuses from the alveoli into the blood,while carbon dioxide diffuses from the blood into the alveoli.Consequently,the blood leaving the lungs through the pulmonary veins is oxygenated,meaning it is rich in oxygen.

Gas	Alveolar Air $(X/A)$	Atmospheric Air $(Y/B)$
$pO_{2}$	$X$	$Y$
$pCO_{2}$	$A$	$B$

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