Thin walls of blood capillaries are most suitable for which function?
Answer and explanation
Correct answer: Exchange of materials between cells and blood
The governing concept is diffusion across exchange surfaces. Capillaries form a fine network beside body cells and have walls only about one cell thick. This short distance allows oxygen and dissolved nutrients to move from blood to tissues, while carbon dioxide and other wastes move into the blood. Their thin walls are therefore best suited for exchange, making option A correct. Pumping is done by the heart, urine is stored in the bladder, and fat emulsification involves bile.
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What is the correct answer to this question?
Exchange of materials between cells and blood
Why is this the correct answer?
The governing concept is diffusion across exchange surfaces. Capillaries form a fine network beside body cells and have walls only about one cell thick. This short distance allows oxygen and dissolved nutrients to move from blood to tissues, while carbon dioxide and other wastes move into the blood. Their thin walls are therefore best suited for exchange, making option A correct. Pumping is done by the heart, urine is stored in the bladder, and fat emulsification involves bile.
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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