The partial pressures (in mm Hg) of oxygen ( | vedclass

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(A) In the human respiratory system,the exchange of gases occurs at the alveoli by simple diffusion based on pressure gradients.At the alveoli,the par

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$pO_{2} = 104$ and $pCO_{2} = 40$

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(A) In the human respiratory system,the exchange of gases occurs at the alveoli by simple diffusion based on pressure gradients.At the alveoli,the partial pressure of oxygen $(pO_{2})$ is $104 \ mm \ Hg$.The partial pressure of carbon dioxide $(pCO_{2})$ at the alveoli is $40 \ mm \ Hg$.These values facilitate the diffusion of $O_{2}$ from the alveoli into the blood and $CO_{2}$ from the blood into the alveoli.

The partial pressures (in $mm \ Hg$) of oxygen $(O_{2})$ and carbon dioxide $(CO_{2})$ at the alveoli (the site of diffusion) are:

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