precapillary sphincter
noun
: a sphincter of smooth muscle tissue located at the arterial end of a capillary and serving to control the flow of blood to the tissues
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“Precapillary sphincter.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/precapillary%20sphincter. Accessed 26 Apr. 2024.
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