Why is it necessary for the human respiratory surface to be moist and thin?
Answer and explanation
Correct answer: To allow fast and easy diffusion of gases
The governing concept is diffusion at the respiratory surface. A moist surface allows oxygen and carbon dioxide to dissolve before crossing the membrane, while a thin surface provides a short diffusion distance. These features permit rapid movement of oxygen into blood and carbon dioxide out of blood, supporting efficient respiration. Hence A is correct. Making food sweet, changing blood colour, and dissolving bones have no connection with the structure of alveoli.
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What is the correct answer to this question?
To allow fast and easy diffusion of gases
Why is this the correct answer?
The governing concept is diffusion at the respiratory surface. A moist surface allows oxygen and carbon dioxide to dissolve before crossing the membrane, while a thin surface provides a short diffusion distance. These features permit rapid movement of oxygen into blood and carbon dioxide out of blood, supporting efficient respiration. Hence A is correct. Making food sweet, changing blood colour, and dissolving bones have no connection with the structure of alveoli.
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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