Why is it useful that blood capillaries surround alveoli in the lungs?
Answer and explanation
Correct answer: So that gases can exchange quickly
The governing concept is efficient gaseous exchange by diffusion. Alveoli provide a large moist surface, and the surrounding capillary network keeps blood in close contact with the air across a very thin barrier. Oxygen therefore diffuses into the blood, while carbon dioxide diffuses from the blood into the alveolar air for exhalation. Close capillaries do not digest food, produce urine or make light. Hence option A is correct.
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What is the correct answer to this question?
So that gases can exchange quickly
Why is this the correct answer?
The governing concept is efficient gaseous exchange by diffusion. Alveoli provide a large moist surface, and the surrounding capillary network keeps blood in close contact with the air across a very thin barrier. Oxygen therefore diffuses into the blood, while carbon dioxide diffuses from the blood into the alveolar air for exhalation. Close capillaries do not digest food, produce urine or make light. Hence option A is correct.
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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