Download 2 division Digestive system parts –GI

3 Main funct. of digestive system
Digestion : mechanical & chemical
Absorption: mostly SM intestine
Elimination
NS control the digestive system
parasympathetic ^
activity sympathetic
activity
2 division
Digestive tract (mouth to anus- GI)
accessory organs: gallbladder, pancreas, salivary
glands and liver
digestion
The mouth - swallowing process Mechanical
smaller particles allows
Ingestion: receiving food
enzymes acids
Mastication Chewing
chemicals to work
forms a bolus (ball of food)
Mixing: saliva &
. Mylase (break down starch)
Deglutition (tongue sends bolus to pharynx)
Swallowing occurs by involuntary process.
Uvula and soft palate raise to protect the nose from
up-flow of food; Tongue is raised to seal of back of mouth.
Epiglottis descends to cover the opening of the larynx.
Bolus is moved to the esophagus where it is pushed
down into the stomach
Mouth parts
Pharynx: naso, oral and lary
pharynx;
soft plate, palatine tonsil, uvula
and epiglottis
STUCTURE
Greater curvature
STOMACH
FUNCTION
Stores food and liquid
Greater curvature
Secretes gastric juice
Fundus (the top)
Secretes mucus
Cardiac Sphincter
Mechanical and chemical
digestion
Rugae (inner folds)
HCL- trigger
pepsinogen
pepsin- break down
proteins
Pylorus last part of stomach
Pyloric Sphincter sto/ sm
int
Lubricate food with mucus and
move food by peristalsis
function
Manly absorb h20 nutrients
Secret mucus to protect
Enzyme to break down food
Villi- fingerlike ^ mucosa surface
Microvilli- SM intestine protection ^ surface
area to absorb nutrients
Lacteal lymphatic: capillaries that absorb fat
droplests
Digestive system parts –GIMouth
Pharynx
Esophagus
Stomach
SM Intestine
LG Intestine
Rectus
Anus
Function of LG intestine
Secrete mucus
Reabsorbs water
Form feces (stool) Defecation
Bacteria colon produce vitamin K and
some B complex vitamins
Antibiotic therapy can destroy these helpful bacteria
and cause side effects.