why blood capillaries have single layer of epithelial cells?
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capaillaries need to be thin wall so that nutrient and oxygen can easily pass through them to body
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Capillaries are smallest of all blood vessels and their wall is made up of single layer of epithelial cells known as endothelium. They help to enable the exchange of water, oxygen, carbon dioxide, and many other nutrients and waste substances between the blood and the tissues.
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