Why should the respiratory surface in humans be moist?
Answer and explanation
Correct answer: To make exchange of gases easier after dissolving
The governing concept is diffusion across a respiratory surface. In the lungs, the moist lining of the alveoli allows oxygen and carbon dioxide to dissolve before crossing the very thin alveolar-capillary membrane. This supports rapid diffusion down concentration gradients: oxygen enters the blood and carbon dioxide leaves it. A moist surface does not sweeten food, strengthen bones or clot blood. Therefore option A is correct.
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What is the correct answer to this question?
To make exchange of gases easier after dissolving
Why is this the correct answer?
The governing concept is diffusion across a respiratory surface. In the lungs, the moist lining of the alveoli allows oxygen and carbon dioxide to dissolve before crossing the very thin alveolar-capillary membrane. This supports rapid diffusion down concentration gradients: oxygen enters the blood and carbon dioxide leaves it. A moist surface does not sweeten food, strengthen bones or clot blood. Therefore 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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