lecture exam 4- Ch.25 Flashcards
process of breaking down food into simpler forms through mechanical & chemical manipulation in the gastrointestinal tract (GI); resulting in absorption of nutrients
digestion
entry of material in mouth
ingestion
churning, segmentation, & grinding of ingested food
mechanical digestion
acid, enzymes, buffers, & emulsifying salts secreted to break chemical bonds
chemical digestion
movement of simplified macronutrients, micronutrients, & water into interstitial fluid of GI tract
absorption
unabsorbed ingesta, undigested food, metabolic waste, sloughed cells of GI lining & bacteria
excretion
dehydration & compaction of waste material; fecal formation
compaction
food –> ____ –> ___
bolus; chyme
individual amino acids & peptides
proteins
micelles, spheres of FAs & monoglycerides
fats
- simple sugar (monosaccharides): fructose, glucose
- structural carbohydrates: fiber is not absorbed
sugars
diffuses through SI & LI
water
some diffuse; many use micelles
- vitamins: C, B12, E, K
- minerals: calcium, phosphorus, iron
micronutrients
enzymes rely on specific pHs; concentration of H+
- stomach pH pf 2
- SI pH of 4
pH
inner lining of GI tract; mucous membrane
mucosa
exocrine; large lymphatic & vasculature
submucosa
propels ingesta; form sphincters
muscular layer
serous membrane
serosa
whats labeled A
mucosa
whats labeled B
submucosa
whats labeled C
muscular layer
whats labeled D
serosa
whats labeled E
myenteric neural plexus
whats labeled F
circular fold
- longitudinal muscle
- circular muscle
peristalsis
involved with mechanical digestion; churn; no propulsion; only circular
segmentation
segmentation
peristalsis
whats labeled A
oral cavity
- stratified squamous epithelium
whats labeled B
pharynx
- stratified squamous
whats labeled C
esophagus
- stratified squamous epithelium
whats labeled E
stomach
- stratified squamous eputhelium
whats labeled F
small intestine
whats labeled G
large intestine
whats labeled H
salivary glands
whats labeled I
liver
whats labeled J
gallbladder
whats labeled K
pancreas
serosal membrane
- visceral
- parietal
peritoneum
double peritoneal membranes w/ areolar tissue in between
- support organs
- vasculature, lymphatic, nervous connections
mesenteries
whats labeled A
transverse colon
whats labeled B
ascending colon
whats labeled C
mesentery proper (mesenterial sheet)
whats labeled D
descending colon
whats labeled E
sigmoid colon
- sensory analysis of food
- mechanical digestion
- chemical digestion
- lubrication of food
oral cavity
whats labeled A
openings of submandibular ducts
whats labeled B
frenulum of tongue
whats labeled C
frenulum of upper lip
whats labeled A
opening of parotid duct
whats labeled B
dorsum of tongue
whats labeled C
pharyngeal tonsil
whats labeled D
nasopharynx
whats labeled E
uvula
whats labeled F
lingual tonsil
whats labeled G
epiglottis
whats labeled H
laryngopharynx
whats labeled A
sublingual gland
whats labeled B
submandibular gland
whats labeled C
parotid gland
mucin based mixture
saliva
beginning of chemical digestion
enzymes
breaks starch & glycogen into maltose
salivary amylases
breaks down fats
lingual lipase
whats labeled A
crown
whats labeled B
enamel
whats labeled C
dentine
whats labeled D
pulp cavity
whats labeled E
gingiva
whats labeled F
alveolar process
whats labeled A
temporalis
whats labeled B
masseter
whats labeled C
capsule of temporomandibular joint
whats labeled A
lateral pterygoid
whats labeled B
medial pterygoid
general tongue movement
extrinsic tongue muscles
movements associated with speech
intrinsic tongue muscles
whats labeled A
styloglossus
whats labeled B
genloglossus
whats labeled C
hyoglossus
swallowing
deglutition
voluntary, deglutition can be initiated by bolus reaching oropharynx
- bolus at hard palate
- tongue retracts
buccal
1) buccal phase
involuntary
- larynx elevation (closes epiglottis)
- pharyngeal muscles squeeze bolus to esophagus
pharyngeal
2) pharyngeal phase
involuntary
bolus movement down esophagus via peristalsis
- opening of upper esophageal sphincter (skel)
- esophagus
- opening of lower esophageal spincter (smooth)
- stomach
esophageal
3) esophageal phase
Opening in diaphragm that esophagus travels through
esophageal hiatus
whats labeled A
muscularis mucosae
whats labeled B
mucosa
whats labeled C
submucosa
whats labeled D
muscular layer
whats labeled E
adventitia
whats labeled F
the esophagus
(does not have serosa)
peristalsis
- stores ingesta
- first site of significant chemical digestion: pepsin; low pH
- mechanical digestion
- formation of chyme
stomach
whats labeled A
longitudinal muscle layer
whats labeled B
circular muscle layer
whats labeled C
oblique muscle layer (overlying mucosa)
gastric folds = ___
gastric rugae
- mucous
- parietal
- chief
- enteroendocrine
gastric cells
mucin
mucous
HCl
parietal
pepsinogen
chief
hormones
- G: gastrin; stimulates parietal cells
enteroendocrine