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Posted 6 year ago
Why the cell wall of capillaries are very thin?
1 Answer(s)
Nisha Nikam
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Posted 6 year ago Nisha Nikam

A single capillary is so small that it allows only one blood cell to flow through it at a time. The capillary walls are also very small, only one cell thick. These thin walls easily allow water, oxygen, carbon dioxide, and other nutrient and waste substances to exchange between blood cells and the surrounding tissue