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Blood capillaries are made of

1. endothelium, connective tissue and muscle fibres
2. endothelium and muscle fibres
3. endothelium and connective tissue
4. endothelium only

Correct answer: endothelium only

Solution

Blood capillaries consist of a single layer of endothelial cells to allow rapid exchange of gases, nutrients, and wastes. They do not have muscle or connective tissue layers like larger blood vessels.

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