Flashcards in DIGESTION Deck (22)
4 stages of processing nutirents
sequential process of breaking down into smaller pieces/parts at the end of digestion, left with small absorbable molecules.
cells take up amino acids, sugars, fatty acids
undigested material passes out of digestive system
particles taken in by phagocytosis or pinocytosis (small organisms)
occurs in specialized compartments that are contiguous with outside of the body.
ex. gizzard, Gastric ceca.
first 10 seconds
oral cavity, pharynx and esophagus
food triggers saliva
mucin coats/protects oral cavity
peristalisis-waves of coordinated muscular contractions move the food bolus to the stomach in an involuntary fashion
Stomach 2-6 hours
stores food and begins the chemical digestive process
can hold about 2L of food
contents are mixed with gastric juice about every 30 sec. to digest food.
both exit and entry closed off by sphincters
when the protection beaks down in the lining of the stomach
life in the proximal small intestine
most of enzymatic hydrolysis and nutrient absorption is here
contributes to the nutrient and water absorption
primarily absorbs vitamin B12, bile salts and anything the jejunum missed.
large number of folds in the lining of the intestine
epithelial cells have microvilli
nutrients absorbed goes straight to the circulatory system
the large intestine, colon, and anus
stores feces until their elimination through the anus
helps restore bacteria in colon
function in immune response
breaks down proteins into smaller peptides