Bronchoconstriction in the airways is stimulated by
1. perfusion.
2. ventilation.
3. the sympathetic nervous system.
4. parasympathetic nervous system.
Correct Answer: 4
Rationale 1: Perfusion is the flow of blood in the lungs.
Rationale 2: Ventilation moves air in and out.
Rationale 3: The sympathetic nervous system stimulates dilation.
Rationale 4: The parasympathetic nervous system stimulates bronchoconstriction.
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