Capillary beds have precapillary at the junction of capillaries and the metarteriole.

Precapillary Sphincters

Explanation: Capillary beds have precapillary sphincters at the junction of capillaries and the met arteriole. Constriction of these sphincters reduces the blood flow through their respective capillaries. When this occurs, blood is diverted to tissue or organs elsewhere.

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stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.