(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

(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.

Class 11 Biology Breathing and Exchange of Gases Exchange of gases

Medium

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

A
More space for increasing the volume of inspired air
B
More surface area for diffusion of gases
C
More spongy texture for keeping lungs in proper shape
D
More nerve supply to keep organs active when working

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Class 11

Biology Questions

Chapter

Breathing and Exchange of Gases

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Exchange of gases

The given figure shows a small part of the human lung where gas exchange occurs. Identify the part $A, B, C,$ or $D$ correctly with its function from the given options.

Medium

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

MediumAIIMS 2009

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Analogy type question:
$(1)$ Atmospheric air enters: Inspiration :: Alveolar air released out: ..........
$(2)$ $O_2$ in alveoli: $104 \, mm \, Hg$ :: $CO_2$ in alveoli: ..........

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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.

MediumNEET 2016

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Body cells must continuously receive $P$ and release $Q$ produced by the cells. What are $P$ and $Q$ in the given statement?
$P \quad Q$

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

Similar Questions

The given figure shows a small part of the human lung where gas exchange occurs. Identify the part $A, B, C,$ or $D$ correctly with its function from the given options.

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

Analogy type question:$(1)$ Atmospheric air enters: Inspiration :: Alveolar air released out: ..........$(2)$ $O_2$ in alveoli: $104 \, mm \, Hg$ :: $CO_2$ in 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.

Body cells must continuously receive $P$ and release $Q$ produced by the cells. What are $P$ and $Q$ in the given statement?$P \quad Q$

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Analogy type question:
$(1)$ Atmospheric air enters: Inspiration :: Alveolar air released out: ..........
$(2)$ $O_2$ in alveoli: $104 \, mm \, Hg$ :: $CO_2$ in alveoli: ..........

Body cells must continuously receive $P$ and release $Q$ produced by the cells. What are $P$ and $Q$ in the given statement?
$P \quad Q$