Exchange of gases in lungs occurs through

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(A) Exchange of gases in the lungs is known as external respiration.In this process,oxygen moves from the alveoli into the pulmonary capillary blood,w

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Simple diffusion

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(A) Exchange of gases in the lungs is known as external respiration.In this process,oxygen moves from the alveoli into the pulmonary capillary blood,while carbon dioxide moves from the pulmonary capillaries into the alveoli.The exchange of gases across the alveocapillary membrane is a purely physical process known as simple diffusion.This process is driven by partial pressure gradients and does not involve any active transport or chemical reactions.

Column-$I$	Column-$II$ ($PO_2$ in $mm\, Hg$)
$P$. Atmospheric air	$I$. $159$
$Q$. Tissues	$II$. $95$
$R$. Oxygenated blood	$III$. $40$

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Match the partial pressures of oxygen in different parts involved in diffusion compared to the atmosphere.
Column-$I$ Column-$II$ ($PO_2$ in $mm\, Hg$)
$P$. Atmospheric air $I$. $159$
$Q$. Tissues $II$. $95$
$R$. Oxygenated blood $III$. $40$

Under normal physiological conditions,$100 \, mL$ of oxygenated blood delivers how much $CO_2$ to the alveoli?

Water vapor exits from the leaves of terrestrial plants through open stomata. During photosynthesis,carbon dioxide enters the plant through the same open stomata. Identify the reason for the above statements from the following options.

The diffusion membrane is made up of:

The diagram below represents part of a capillary in a specific region of the human body. The region labeled $X$ represents part of

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