human physiology sequence of the deglutition of the bolus

airway anatomy aspiration body bolus bone cartoon cavity choking contractions cough deglutition design educational epiglottis esophagus food gastric glottis gravity hard health human hyoid ideal illustration institutional isolated jaw materials mechanism medicine mouth movement muscle nasal nasopharynx oral palate passage pharynx phases physiology positive pressure push reflex reflux regurgitation saliva sequence sphincters stomach suction tongue vector vomiting