Why are alveoli effective for exchange of gases?
Answer and explanation
Correct answer: They have thin walls and a large surface area
The governing concept is adaptation for efficient diffusion. Alveoli are numerous tiny air sacs with very thin, moist walls, creating a large surface area. A dense network of blood capillaries surrounds them, maintaining a concentration gradient so oxygen diffuses into blood and carbon dioxide diffuses into the alveolar air. Thus option A is correct. Digestion, urine formation and bile production occur in other organs.
Frequently asked questions
What is the correct answer to this question?
They have thin walls and a large surface area
Why is this the correct answer?
The governing concept is adaptation for efficient diffusion. Alveoli are numerous tiny air sacs with very thin, moist walls, creating a large surface area. A dense network of blood capillaries surrounds them, maintaining a concentration gradient so oxygen diffuses into blood and carbon dioxide diffuses into the alveolar air. Thus option A is correct. Digestion, urine formation and bile production occur in other organs.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Life Processes.
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