The cough reflex a deep breath---glottic closure---relaxation of diaphragm, contraction of expiratory muscle- positive thoracic pressure--suddenly release of glottis open---thoracic positive pressure airflow out---cough reflexThe cough reflex A deep breath---glottic closure---relaxation of diaphragm, contraction of expiratory muscle--- positive thoracic pressure--suddenly release of glottis open---thoracic positive pressure airflow out--- cough reflex