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(B) The exchange of gases between the blood and the tissues occurs through the systemic capillaries. Oxygenated blood reaches the tissues via systemic

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capillaries surrounding tissue cells

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(B) The exchange of gases between the blood and the tissues occurs through the systemic capillaries. Oxygenated blood reaches the tissues via systemic arteries,which branch into a network of capillaries. Since the partial pressure of oxygen $(pO_2)$ is lower in the tissue cells compared to the blood in the capillaries,oxygen dissociates from oxyhemoglobin and diffuses into the tissues. Therefore,the maximum exchange of oxygen from the blood to the cells occurs in the capillaries surrounding the tissue cells.

Gas	Atmospheric Air	Alveoli
$O_{2}$	$159$	$A$
$CO_{2}$	$0.3$	$B$

Maximum amount of oxygen is exchanged from the blood in the . . . . . . .

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Partial pressure (in $mm \ Hg$) of oxygen and carbon dioxide at different parts involved in diffusion in comparison to those in the atmosphere. Identify $A$ and $B$ and choose the correct option accordingly.
Gas Atmospheric Air Alveoli
$O_{2}$ $159$ $A$
$CO_{2}$ $0.3$ $B$

Maximum amount of oxygen is lost from the blood in the

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