Precapillary sphincters allow blood to leave this structure and enter true capillaries.

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Metarterioles have precapillary sphincters that can open or close to regulate blood flow into true capillaries. Sinusoids are a type of capillary with large gaps that allow for the passage of larger molecules and cells. Fenestrated capillaries have small pores in their walls, while continuous capillaries have no pores but do have tight junctions between cells.

Precapillary Sphincters Allow Blood to Leave This Structure and Enter