In humans,exchange of gases occurs

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(D) Alveoli are the primary site of exchange of gases.Exchange of gases also occurs between the blood and tissues.$O_{2}$ and $CO_{2}$ are exchanged a

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(D) Alveoli are the primary site of exchange of gases.Exchange of gases also occurs between the blood and tissues.$O_{2}$ and $CO_{2}$ are exchanged at these sites by simple diffusion,primarily based on the pressure/concentration gradient.The pressure/concentration gradient,solubility of gases,and the thickness of the membranes involved in diffusion are some important factors that affect the rate of diffusion.

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

Similar Questions

Identify $A, B$ and $C$ in the given diagram and choose the correct option accordingly.

In which part does gaseous exchange take place in a rabbit?

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 $III$. $40$

The exchange of gases $(O_2 \text{ and } CO_2)$ in a mammal takes place in:

The solubility of $CO_2$ is ....... times higher than that of $O_2$.

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