In a capillary bed, relaxation of the precapillary sphincters causes more blood to flow

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Relaxation of the precapillary sphincters allows blood to flow through the true capillaries, which are the smallest blood vessels in the body and where gas and nutrient exchange occurs between the blood and surrounding tissues. The thoroughfare channels and metarterioles are alternative pathways for blood flow when the precapillary sphincters are constricted. Arterioles are larger blood vessels that lead into the capillary bed and are not directly affected by the relaxation of precapillary sphincters.

In a Capillary Bed, Relaxation of the Precapillary Sphincters Causes