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is a potent vasodilator ....

__________is a potent vasodilator .

A

Histamine

B

Serotonin

C

Codeine

D

Cimetidine

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Term "Vasodilator":** - A vasodilator is a substance that causes blood vessels to widen (dilate), which helps to lower blood pressure and improve blood flow. 2. **Identifying Potent Vasodilators:** - Potent vasodilators are drugs or substances that have a strong effect in relaxing the smooth muscles of blood vessels, leading to increased diameter and reduced blood pressure. 3. **Role of Histamine:** - Histamine is a chemical that is involved in various physiological functions, including the immune response and regulation of stomach acid. Importantly, it is also known to act as a potent vasodilator. 4. **Mechanism of Action:** - When histamine is released in the body, it binds to specific receptors on the smooth muscle cells of blood vessels, causing them to relax. This relaxation leads to the widening of the blood vessels, which reduces the resistance to blood flow. 5. **Conclusion:** - Based on the understanding that histamine is a potent vasodilator that helps to widen blood vessels and improve blood flow, we can conclude that the answer to the question is **Histamine**. **Final Answer: Histamine is a potent vasodilator.** ---
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