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(D) The presence of a large number of alveoli significantly increases the surface area available for the exchange of gases. In mammalian lungs,the alv

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Efficient system for the exchange of large amounts of residual air.

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(D) The presence of a large number of alveoli significantly increases the surface area available for the exchange of gases. In mammalian lungs,the alveolar ducts open into numerous alveoli,which are the primary sites of gas exchange. This structural arrangement ensures an efficient system for the exchange of large volumes of air,including the residual air,by maximizing the contact area between the air and the pulmonary capillaries.

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

What does the presence of a large number of alveoli around the alveolar duct opening into the bronchioles in mammalian lungs indicate?

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How much $CO_2$ is delivered to the alveoli by every $100 \;ml$ of deoxygenated blood (in $;ml$)?

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

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
$O_{2}$ $159$ $A$
$CO_{2}$ $0.3$ $B$

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