Why is there a dense network of blood capillaries around alveoli?
Answer and explanation
Correct answer: To transfer respiratory gases rapidly between alveolar air and blood
The governing concept is rapid diffusion across a thin respiratory surface. Alveoli contain air, while the surrounding capillaries carry deoxygenated and oxygenated blood. Their dense network keeps blood close to a large alveolar surface, maintaining a short diffusion distance and concentration gradients. Thus option A is correct; the other options refer to digestion, plant transport or excretion.
Frequently asked questions
What is the correct answer to this question?
To transfer respiratory gases rapidly between alveolar air and blood
Why is this the correct answer?
The governing concept is rapid diffusion across a thin respiratory surface. Alveoli contain air, while the surrounding capillaries carry deoxygenated and oxygenated blood. Their dense network keeps blood close to a large alveolar surface, maintaining a short diffusion distance and concentration gradients. Thus option A is correct; the other options refer to digestion, plant transport or excretion.
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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