What does the primary mechanism of action of Nitroglycerin involve?

The primary mechanism of action of Nitroglycerin is vasodilation. Nitroglycerin, a nitrate medication, works by relaxing the smooth muscles in the walls of blood vessels, leading to their dilation. This vasodilation primarily affects the venous system, reducing venous return to the heart and consequently lowering the workload on the heart. By dilating the coronary arteries, Nitroglycerin also improves blood flow to the myocardium, which is especially beneficial in conditions such as angina, where the heart muscle is not receiving enough oxygen.

In contrast, options involving increased oxygen demand, reduced heart rate, and enhanced oxygen consumption do not reflect the primary action of Nitroglycerin. Instead, Nitroglycerin aims to decrease oxygen demand by alleviating the stress on the heart muscle through vasodilation rather than increasing the workload or the overall demand for oxygen.