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Question

The nose serves all the following functions except ________. 


  1. as a passageway for air movement

  2. as the initiator of the cough reflex

  3. warming and humidifying the air 

  4. cleansing the air


Solution

The correct option is B

as the initiator of the cough reflex


The cough reflex has both sensory (afferent) mainly via the vagus nerve and motor (efferent) components. Pulmonary irritant receptors (cough receptors) in the epithelium of the respiratory tract are sensitive to both mechanical and chemical stimuli.

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