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What is the primary function of histamine?

Options

  1. ATo contract smooth muscles in blood vessels
  2. BTo relax smooth muscles in the bronchi and gut
  3. CTo cause nasal congestion
  4. DTo stimulate allergic responses

Correct answer

B. To relax smooth muscles in the bronchi and gut

Step-by-step solution

Histamine contracts the smooth muscles in the bronchi and gut and relaxes other muscles.

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