digestive Flashcards
enzymes
proteins used as catalysts to speed up chemical reactions
macromolecules (biological)
proteins, lipids, carbs, nucleic acids
monomers
sugars, amino acids, fatty acids, nucleotides
alimentary canal
GI tract
peristalsis
involuntary movement of food through digestive tract
GI tract layers-4
- mucosa
- submucosa
- muscularis externa
- serosa
parietal cells
release hydrochloric acid
chief cells
release pepsinogen
enteroendocrine cells
regulate stomach and release serotonin, histamine, and somatostatin
somatostatin
inhibit secretions
G cells
make gastrin
digestive phases-3
- cephalic
- gastric
- intestinal
long reflex arc
when signal travels to brain and back
short reflex arc
signal zips around within stomach own nervous system
small intestine-3
- duodenum- chemical digestion
- jejunum- nutrient absorption
- ileum- vitamin absorption
amylase
carbs to glucose and fructose
haustral contractions
large intestine contraction
catabolic reactions
destroys reactants reducing complex substances into molecules
-makes energy
anabolic reactions
reassembles molecules
-consumes energy
1 glucose
32 ATP