alleryCapillary walls are only one cell thick because they
AAllow easy exchange of materials with tissues
BMust withstand the high pressure from the aorta
CNeed to store extra blood for emergency use
DMust pump blood against gravity in the legs
Answer & Solution
Correct answer: A. Allow easy exchange of materials with tissues
1. Capillaries are the smallest blood vessels.
2. Their wall is a single layer of endothelial cells.
3. This thin wall lets gases, nutrients and wastes diffuse easily.
4. So option A is correct.
_Source: Selina Concise Biology Class 10, Ch 7 The Circulatory System (Mistral OCR'd PDF), section on capillaries_
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