Blood flow can be controlled by the sphincters, cooling will make the sphincter's muscles contract.
Sphincters are circular-shaped or funnel-shaped muscles that regulate the flow of substances in the human body by the opening and closing of the pathways.
These are found in the blood and urinary tract, therefore, the flow of materials such as urine, feces, and bile throughout the body takes place through the regulation of Sphincters.
They extend all the way down to the intestine in the form of a thick circular layer of muscles.
These muscles relax and tighten due to which the movement of substances continues.
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