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