Documents Cough and expectoration zhengcuixia. Concept A protective reflex act clean excessive secretion &...

Cough and expectoration zhengcuixia Concept A protective reflex act clean excessive secretion & foreign material Initiated by miscellaneous stimuli or by voluntary exertion.…

Documents Cough and expectoration

Cough and expectoration zhengcuixia Concept A protective reflex act clean excessive secretion & foreign material Initiated by miscellaneous stimuli or by voluntary exertion.…