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A vasoconstrictor is a substance that causes blood vessels to narrow, which can increase blood pressure and reduce blood flow to certain areas of the body. This physiological response is typically mediated by the contraction of smooth muscle in the vessel walls. Vasoconstrictors can be hormones, such as norepinephrine and angiotensin II, or drugs used in medical treatments. They play a crucial role in regulating blood circulation and responding to various physiological needs.
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