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单词 Capillary blood vessel
释义

Capillary blood vessel

英语百科

Capillary

Diagram of a capillary
Depiction of the major types of capillaries, showing fenestrations as well as intercellular gaps.

Capillaries (/ˈkæplɛriz/ in US; /kəˈpɪləriz/ in UK) are the smallest of a body's blood vessels (and lymph vessels) that make up the microcirculation. Their endothelial linings are only one cell layer thick. These microvessels, measuring around 5 to 10 micrometres (µm) in diameter, connect arterioles and venules, and they help to enable the exchange of water, oxygen, carbon dioxide, and many other nutrients and waste substances between the blood and the tissues surrounding them. Lymph capillaries connect with larger lymph vessels to drain lymph collected in the microcirculation.

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