A ring of muscle surrounding a blood vessel at the junction between an arteriole and capillary. It can effectively open and close the capillary, and facilitates shunting.
precapillary sphincter
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 | Precapillary sphincter |
| Metarteriole |
| Acrocyanosis (benign) |
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 | Sports Science and Medicine. The Oxford Dictionary of Sports Science & Medicine. Copyright © Michael Kent 1998, 2006, 2007. All rights reserved. Read more |
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