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Digestive system
Digestive system
72
Biology
Undergraduate 3
06/20/2010

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Term
Tunica Mucosa
Definition
secretion, absorption, and protection. mucous membrane or mucose. Any body cavity that leads to the outside. Layers: Epithithelium, lamina propria, musculairs mucosae- fine movement, inner and outer. Sphincters: rings of muscle going around a tube. Inner circular layer
Term
Tunica Submucosa
Definition
connective tissue. glands as extensions of epithelium in duodenum (Brunner's gland) Peyer's patches lymphatic nodules (within the ileum) Function: blood vessels, delivers nutrients to epithelium, highly vascularized
Term
Tunica Muscularis
Definition
muscle contraction. Inner circular layer (thickened to form sphincters) throughout cardiac, pyloric, ileocolic & internal anal sphincters, outer longitudinal layer. Taeniae coli in LI which form pouches or sacculations called haustra. Peristalsis- rhythmical contractions moving food in one way. Segmentation, different regions contract, sloshed back and fourth
Term
Tunica serosa/tunica adventitia (thicker)
Definition
think outside layer, simple squamous epithelium. Function: secrete serous fluid to reduce friction
Term
Visceral Peritoneum
Definition
hugging organ
Term
Parietal peritoneum
Definition
holding wall
Term
Mesentery fold
Definition
fold of peritoneum
Term
Falciform ligament
Definition
anchor liver from diaphragm
Term
Greater omentum
Definition
attaches to stomach. Keep organs lubricated
Term
Ulcer
Definition
erosion of tunics. Erosion gone through all 4 walls
Term
Stages of cancer- 0
Definition
only penetrated mucosa
Term
Stages of cancer-1
Definition
into submucosa
Term
stages of cancer-2
Definition
invaded muscularis
Term
stages of cancer-3
Definition
goes to tunica serosa but doesn't invade
Term
stages of cancer-4
Definition
penetrated all layers and metastasized
Term
Epithelium (TMucosa)
Definition
stratified squamous from lips to cardiac sphincter. stratified squamous at ano-rectal junction. simple columnar from gastro-esophageal junction through rectum. Epithelial cell types: mucus neck cells, chief cells, parietal cells, enteroendocrine cells, smple columnar cell with brush border, goblet cells, simple columnar cells with no brush border
Term
Lamina Propria (TMucosa)
Definition
penetrated by gastric glands in stomach. Found within the villi of SI & penetrated by intestinal crypts. Penetrated by intestinal glands of LI
Term
Muscularis mucosae
Definition
thin, scanty, smooth muscle layer, longitudinal folds of esophagus, plicae in SI & LI. Plicae circulares-SI, plicae semilunares- (LI)
Term
stomach
Definition
holding tank for food. Inner oblique, middle circular, outer longitudinal
Term
rugae
Definition
muscular edges when empty. When full they disappear
Term
plicae circularis (SI)
Definition
bumps increase surface area. deep permanent. 3x
Term
Villi (SI)
Definition
only in small intestine. 10x
Term
Microvilli
Definition
finger like projections. 20x
Term
celiac disease
Definition
body attacks villi when consuming glucose
Term
plicae semilunares (LA)
Definition
ridges in L.A. more undeveloped. Tenica coli-haustra-little sacs
Term
Salivary glands
Definition
produce saliva
Term
Parotid gland
Definition
salivary amylase. works on carbs, lots of water. Mumps- swollen parotid gland
Term
Submandibular gland
Definition
under mandible; secretes salivary amylase & mucous
Term
Sublingual gland
Definition
lots of mucous, under tongue
Term
Saliva
Definition
secretes food to be soft, breaks down bacteria. Lysosome
Term
Pancreas
Definition
Exocrine secretions- trypinogen secretes and produces all
Term
LIver
Definition
falciform and round ligaments. Enclosed in visceral peritoneum. Made up of hepatocytes which secrete bile
Term
Liver digestive function
Definition
Emulsifier- 1 side likes fat, one likes water. Bile- bilirubin.
Term
Jaundice
Definition
Hyperbilirubinemia- yellow cast to skin. Too much bilirubin. Liver cirrhosis. hepatitis
Term
Gall bladder
Definition
store and concentrate gall bladder
Term
gastrin
Definition
stomach mucosa. stim gastric and small intestine motility. Stim secretion of gastric juices
Term
Secretin
Definition
duodnal mucosa. entero, stim bicarbonate ion. stim secretion
Term
CCK
Definition
duodnal mucosa. Contraction of gall bladder. Relaxation of hepatopancreatic sphinctor
Term
Mechanical breakdown
Definition
breaking down molecules from big to small
Term
Chyme
Definition
water with food. soup
Term
SI digestion
Definition
primary chemical breakdown. Absorption of nutrients
Term
Large intestine haustral churning
Definition
sloshing
Term
Monosaccharides
Definition
glucose, fructose, galactose
Term
Mouth carbs
Definition
salivary amylase
Term
stomach carbs
Definition
lots acids. no digestion
Term
small intestine
Definition
pancreatic amylase
Term
Maltose
Definition
glucose + glucose
Term
Sucrose
Definition
glucose + fructose
Term
lactose
Definition
glucose + galactose
Term
Brush border enzymes
Definition
oligo+ tri-> di(dextrinase, glucoamylase), di's to mono (sucrase, lactase, maltase)
Term
glucose, galactose, fructose
Definition
energy. into epithelial cell (brush border) out of epithelial cell
Term
Protein structue
Definition
2 amino acids. Peptide bond holds amino acids together. Amino end and carboxyl end.
Term
mouth
Definition
no breakdown
Term
stomach chief cells
Definition
releases pepsinogen
Term
parietal stomach cells
Definition
H + Cl to pepsin breaks down proteins
Term
Neck (mucous) stomach cells
Definition
g cell to gastrin
Term
Stomach enzyme activation
Definition
HCl activates enzyme and denature (folds down) destroys bacteria. Stimulates release of CCK & secretin. Layer of mucous protects. Asprin inhibits mucous.
Term
Small intestine pancreatic juice
Definition
trypsinogen-trypsin, chymotrypsinogen- chymotrypsin, procarboxypeptidase- carboxypeptidase
Term
What activates trypsin?
Definition
enterokinase
Term
Pancreatitis
Definition
blockage in ducts
Term
Brush border enzymes
Definition
aminopeptidase- break down amino bond. Dipeptidase- cleaves the last one
Term
Endopeptidases: inside chain
Definition
trypsin, chymotrypsin
Term
Exopeptidases: outside chain
Definition
aminopeptidase, carbocypeptidase
Term
Paneth cell
Definition
secretes lysozyme to break bacteria. Brunners gland-alkaline layer of mucus.
Term
Lipid structure
Definition
composed of H and C. saturated fatty acids, unsaturated fatty acids-double bond
Term
Types of lipids
Definition
monoglycerides, diglycerides, triglycerides(mostly eat this)
Term
Mouth enzyme
Definition
lingual lipase
Term
stomach enzyme
Definition
gastric lipase. not effective
Term
small intestine enzyme
Definition
pancreatic lipase, epithelial lipase. Micelles form in lumen and carry fatty elements in brush border
Term
short chain fatty acids
Definition
does mono work. right into blood, no problem
Term
long chain fatty acids
Definition
tryglyceride. A bundle of them, chylomicron
Term
chylomicron
Definition
bundle of triglyceride. fatty elements a lot. VLDL- very low density lipoprotein, fewer fatty elements. Formed in epithelial cells, function to move fat thru blood. Short chain fatty acids move into blood and are transported to the liver by hepatic portal vein.
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