Vomiting (Emesis)
vomiting mechanism step 3d
all stomach/esophageal sphincters relax
chemical agents
chemoreceptor trigger zone -lies next to vomiting center in medula upper part of digestive tract
vomiting mechanism step 3b
closure of glottis
vomiting mechanism step 4b
contraction of abs -compresses ab cavity -increases the intra-ab pressure -viscera pushed upward
vomiting mechanism step 4a
contraction of diaphragm pushes on the stomach
vomiting mechanism step 2
coordinated by vomiting center in medulla
vomiting mechanism step 1
preceded by autonomic discharge
autonomic discharge example
profuse salivation sweating rapid heart rate sensation of nausea
vomiting mechanism step 5
stomach squeezed from top & bottom
causes of vomiting
tactile stimulation of back of throat irritation or distension of stomach/duodenum elevated inter-cranial pressure - head injury dizziness chemical agents phychogenic
vomiting mechanism step 3c
uvula raised to close off nasal cavity
vomiting mechanism step 3a
deep inspiration
does the stomach participate in vomiting
does not participate in vomiting
psychogenic
emotional factors
vomiting definition
forceful expulsion of gastric contents through mouth -not accomplished thru reverse perstalsis of anthrum