Q155 / 200 · NEET 2021 · Zoology

The partial pressures (in $mmHg$ ) of oxygen $(O_{2})$ and carbon dioxide $({CO}_{2})$ at alveoli (the site of diffusion) are:

Correct answer
A
$p O_{2} = 104$ and $p C O_{2} = 40$
B
$p O_{2} = 40$ and $p C O_{2} = 45$
C
$p O_{2} = 95$ and $p C O_{2} = 40$
D
$p O_{2} = 159$ and $p C O_{2} = 0.3$

Solution

Partial pressures (in $mmHg$ ) of $O_{2}$ and ${CO}_{2}$ at different sites of the body and in the atmosphere:

Respiratory Gases	Atmospheric pressure	Alveoli	Oxygenated Blood	Deoxygenated Blood	Tissues
$O_{2}$	$159$	$104$	$95$	$40$	$40$
${CO}_{2}$	$0.3$	$40$	$40$	$45$	$45$

Hence, the correct answer is option: 'A'.

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