cue cards that i missed Flashcards
where does mechanical digestion begin?
the mouth
mechanical digestion in the mouth
chewing shreds food into small pieces to swallow
saliva role in mechanical digestion
- softens rough/sharp foods
- moistens and coats foods, making it slippery
mastication role in mechanical digestion
releases nutrients trapped inside indigestible skins
ex. corn kernels, pomegranate seeds
role of stomach and intestines
liquify foods
peristalsis
wave-like muscular squeezing
- begins with tongues movement, then the esophagus and pushes food along DT
order that food moves through the GI tract?
- esophagus
- stomach
- small intestine
- large intestine
what is at the base of the esophagus?
sphincter muscle
lower esophageal sphincter (LES or cardiac sphincter)
prevents reflux of stomach contents into the esophagus
stomach role in mechanical digestion
holds food, mashes it, and liquefies it
chyme
liquefied food
- result of both mechanical and chemical breakdown
when is chyme released?
released into SI little by little when pyloric valve (sphincter) opens
- chyme squirted forcefully into SI
where does the vast majority of absorption occur?
SI with the help of segmentation
segmentation
alternating forward and backward movement allows for greater contact between partially digested food and intestinal juices and enzymes
what is absorbed in stomach?
medication and some alcohol
