What is the main advantage of blood capillaries around alveoli?
Answer and explanation
Correct answer: To quickly carry gases to and from the blood
The governing concept is efficient gaseous exchange in the lungs. Alveoli have very thin walls and are surrounded by a dense network of capillaries. Oxygen diffuses from the alveolar air into the blood, while carbon dioxide diffuses from the blood into the alveoli to be exhaled. Their close contact shortens the diffusion distance, so option A is correct. The other options describe functions of digestion or excretion, not alveolar capillaries.
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What is the correct answer to this question?
To quickly carry gases to and from the blood
Why is this the correct answer?
The governing concept is efficient gaseous exchange in the lungs. Alveoli have very thin walls and are surrounded by a dense network of capillaries. Oxygen diffuses from the alveolar air into the blood, while carbon dioxide diffuses from the blood into the alveoli to be exhaled. Their close contact shortens the diffusion distance, so option A is correct. The other options describe functions of digestion or excretion, not alveolar capillaries.
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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