NSCF Certified Personal Trainer Practice Exam 2026 - Free Personal Trainer Practice Questions and Study Guide

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Which physiological effect does nitric oxide have on blood vessels?

Constriction

Thickening

Dilation

Nitric oxide plays a crucial role in the regulation of blood flow and blood pressure by affecting the behavior of blood vessels. Specifically, it causes dilation, which means it relaxes the smooth muscle cells in the walls of the blood vessels. This relaxation leads to an increase in the diameter of the blood vessels, allowing more blood to flow through them and reducing vascular resistance.

This vasodilation effect has significant physiological benefits, such as improving blood circulation, enhancing the delivery of oxygen and nutrients to tissues, and helping to regulate blood pressure. It is important in various physiological processes, including exercise performance and cardiovascular health. By promoting the expansion of blood vessels, nitric oxide contributes to an overall decrease in blood pressure and an increase in the efficiency of blood circulation throughout the body.

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