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What effect does histamine have on the muscles in the walls of fine blood vessels?

Options

  1. AIt contracts them.
  2. BIt relaxes them.
  3. CIt has no effect on them.
  4. DIt causes nasal congestion.

Correct answer

B. It relaxes them.

Step-by-step solution

Histamine relaxes the muscles in the walls of fine blood vessels.

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