What is the primary function of a vasodilator?

A vasodilator primarily functions to dilate blood vessels and decrease blood pressure. This occurs because vasodilators relax the smooth muscles within the walls of blood vessels, leading to an increase in their diameter. When blood vessels are wider, the resistance against blood flow reduces, which consequently lowers blood pressure. This mechanism is crucial in treating various cardiovascular conditions, such as hypertension (high blood pressure) and heart failure, as it allows for improved blood flow and oxygen delivery to tissues.

The effect of vasodilators extends to relieving symptoms associated with conditions like angina pectoris, as they can enhance blood flow to the heart muscle by decreasing the workload it has to manage against higher pressure. Overall, the action of vasodilators is fundamental in managing cardiovascular health, making it clear why this option correctly identifies the primary function of this class of medications.