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B
Endothelium and thin coat of connective tissue
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C
Endothelium and thin coat of muscle fibres
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D
Endothelium and thin coat of connectie tissue plus muscle fibres
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Solution
The correct option is A Endothelium only The capillary walls are made of single layer of endothelial cells and basement membrane, the structure defines the function as the exchange of gases occurs through this single layer of cells into the surrounding tissues.