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Blood capillary consists of

1. endothelium only
2. endothelium and thin coat of connective tissue
3. endothelium and thin coat of muscle fibres
4. endothelium and thin coat of connective tissue plus muscle fibres

Correct answer: endothelium and thin coat of connective tissue

Solution

Blood capillaries are the smallest blood vessels and consist of a single layer of endothelial cells, supported by a thin layer of connective tissue.

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