Final answer:
Nitroglycerin relieves pain by increasing blood flow through dilation of blood vessels.
Step-by-step explanation:
Nitroglycerin eases pain by boosting blood flow. It achieves this by prompting the release of nitric oxide (NO), a chemical that prompts blood vessels to widen. This widening, or dilation, enhances blood flow to the affected area, alleviating spasms and lessening pain. Nitroglycerin's mechanism involves causing blood vessels to expand, facilitating a smoother circulation process. This dilation effect aids in reducing discomfort by ensuring better delivery of oxygen and nutrients to the tissues. In essence, nitroglycerin's role in triggering nitric oxide production leads to improved blood vessel function, offering relief from pain associated with restricted blood flow.