PCO_{2} is higher in tissues due to | vedclass

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(B) In the tissues,cellular respiration involves the breakdown of nutrients,a process known as catabolism. During catabolism,oxygen is consumed and ca

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Catabolism

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(B) In the tissues,cellular respiration involves the breakdown of nutrients,a process known as catabolism. During catabolism,oxygen is consumed and carbon dioxide $(CO_{2})$ is produced as a metabolic byproduct. Because $CO_{2}$ is continuously generated in the tissues,its partial pressure $(PCO_{2})$ becomes higher in the tissues compared to the blood. This concentration gradient allows $CO_{2}$ to diffuse from the tissues into the blood,where it is transported to the lungs for exhalation.

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

$PCO_{2}$ is higher in tissues due to

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