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Stomach Physio (Stomach Emptying (REGULATION (Inhibit emptying…
Stomach Physio
Stomach Emptying
intense peristaltic contractions in antrum
intense peristaltic contraction
Pyloric Pump
50-70 cm of water pressure
REGULATION
Promote Emptying
Stretching of stomach wall
local myenteric reflexes in wall
inhibit pylorus
accentuate activity of pyl. pump
Gastrin
Gastrin
secretion of acidic gastric juice
enhances activity of pyl. pump
promotes stomach emptying
G cells of antral mucosa
Inhibit emptying
inhibit pyloric pump
increase tone of pyloric sphincter
Enterogastric Inhibitory Reflex
irritants and acids in duodenal chyme
block release of acidic stomach contents
Pyloric Sphincter
pyloric circular muscle
Mixing and Propulsion of food
Peristaltic constrictor waves "Mixing waves"
begin mid to upper towards antrum
every 15-20 sec
basic electrical rhythm
Peristaltic Action Potential
Peristaltic Constrictive Ring
Retropulsion
upstream squeezing
antral contents squeezed upstream
Hunger Contraction
stomach has been empty for hours
rythmical peristaltic contractions in the body
Hunger Pangs
begin 12 -24 hours
Storage of food
newest food on esophageal opening; oldest food on outer wall of stomach
Vagovagal Reflex
reduces tone of muscular wall of body
relaxed stomach 0.8 - 1.5 L
Divided into
Orad portion
first 2/3 of body
Caudad portion
remainder plus antrum
Chyme
deg of fluidity
amt of food,water,stomach secretion
murky semifluid/paste