Histamine release produces which of the following?
1. Bronchodilation
2. Vasoconstriction
3. Diarrhea
4. Vasodilatation
Correct Answer: 4
Rationale 1: Bronchoconstriction, not bronchodilation, occurs due to smooth muscle responses.
Rationale 2: Vasodilatation, not vasoconstriction, occurs with histamine release.
Rationale 3: Diarrhea is not a sign of histamine release.
Rationale 4: Histamine release causes vasodilatation due to leaky capillaries.
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