Question:
__________________ is a potent vasodilator.
__________________ is a potent vasodilator.
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Histamine is also responsible for the nasal congestion associated with common colds and allergic responses because of its vasodilating properties in the nasal mucosa.
Updated On: May 1, 2026
- Histamine
- Serotonin
- Codeine
- Cimetidine
- Aspirin
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The Correct Option is A
Solution and Explanation
Concept: Vasodilators are substances that cause the widening of blood vessels by relaxing the smooth muscle cells within the vessel walls. This affects blood pressure and inflammatory responses.
Step 1: {Analyze the biological role of Histamine.} Histamine is a biogenic amine involved in local immune responses and acts as a neurotransmitter. One of its primary physiological effects is the relaxation of smooth muscles in blood vessels.
Step 2: {Identify the effect on blood vessels.} When histamine is released, it causes significant vasodilation, increasing the permeability of capillaries to allow white blood cells to engage with pathogens.
Step 3: {Compare with other options.}
• Serotonin is primarily a vasoconstrictor.
• Aspirin is an analgesic and anti-inflammatory drug.
• Cimetidine is an antihistamine (H2-receptor antagonist) used to reduce stomach acid. Therefore, Histamine is the potent vasodilator.
Step 1: {Analyze the biological role of Histamine.} Histamine is a biogenic amine involved in local immune responses and acts as a neurotransmitter. One of its primary physiological effects is the relaxation of smooth muscles in blood vessels.
Step 2: {Identify the effect on blood vessels.} When histamine is released, it causes significant vasodilation, increasing the permeability of capillaries to allow white blood cells to engage with pathogens.
Step 3: {Compare with other options.}
• Serotonin is primarily a vasoconstrictor.
• Aspirin is an analgesic and anti-inflammatory drug.
• Cimetidine is an antihistamine (H2-receptor antagonist) used to reduce stomach acid. Therefore, Histamine is the potent vasodilator.
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