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(B) Step $1$: The respiratory system in humans consists of various structures that facilitate breathing.Step $2$: Within the lungs, the bronchioles te

Vedclass · Accepted Answer

Alveoli

Vedclass · Answer

(B) Step $1$: The respiratory system in humans consists of various structures that facilitate breathing.Step $2$: Within the lungs, the bronchioles terminate in tiny, balloon-like structures called $Alveoli$.Step $3$: These $Alveoli$ are surrounded by a network of blood capillaries, which significantly increases the surface area available for the exchange of $O_2$ and $CO_2$ between the air and the blood.Final Answer: $Alveoli$.

	Carbon dioxide always produced	A lot of energy released
$a.$	No	Yes
$b.$	No	No
$c.$	Yes	No
$d.$	Yes	Yes

Fill in the blank with a suitable word:
. . . . . . in the lungs provide a very large surface area for gaseous exchange.

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Carbon dioxide always produced A lot of energy released

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Fill in the blank with a suitable word:. . . . . . in the lungs provide a very large surface area for gaseous exchange.