Mammalian lungs have an enormous number of mi | vedclass

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(B) The correct answer is $B$. In mammalian lungs,each alveolar duct ends in a passage called an atrium,which leads into a number of rounded alveolar

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More surface area for diffusion of gases

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(B) The correct answer is $B$. In mammalian lungs,each alveolar duct ends in a passage called an atrium,which leads into a number of rounded alveolar sacs. Each alveolar sac is covered with a large number of minute air sacs known as alveoli. The presence of a vast number of alveoli significantly increases the surface area available for the diffusion of gases ($O_2$ and $CO_2$),which is essential for efficient respiration.

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

Mammalian lungs have an enormous number of minute alveoli (air sacs). This is to allow:

Similar Questions

What are the partial pressures of oxygen $(PO_2)$ and carbon dioxide $(PCO_2)$ in the alveolar air?

The blood flowing towards the lungs contains more of which of the following compared to the blood flowing away from the lungs?

Almost the same $pCO_{2}$ in humans is found in

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

The blood coming out of the lungs is richer in which of the following compared to the blood entering the lungs?

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