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19 Cards in this Set

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aka digestive tract
alimentary canal
Intracellular vs Extracellular digestion
Intra: In cell, typically in membrane-bound vesicles
Extra: outside of the cell, in a lumen or tract
Food enters the body in the ____ and goes...
oral cavity, pharynx, esophagus, stomach, small intestine, large intestine.
Inner surface of epithelium is attached to underlying _______ by a ____
connective tissue, basement membrane
Two types of digestion
mechanical vs chemical
In the mouth, food is initially digested by...
mastication expands the SA allowing enzymes to act faster, Salivary Amylase or ptyalin hydrolyzes starch into simple sugars. Toungue makes bolus...
rhythmic wave of involuntary muscle contractions
peristalsis
The stomach is lined with ____ which is comprised of the _____ and ___ glands
thick gastric mucosa; Pyloric and Gastric glands
The gastric glands are stimmed by the _____
brain which responds to the sight/taste/smell of foodies
Compostion of the gastric glands
Mucous (protects stomach lining); Chief (pepsinogen (aymogen of protein-hydrolyzing enzyme, breaks up certain peptide bonds); Parietal (secrete HCl);
End Product of the Stomach
The semi-fluid CHYME
Regulates the Passage of food from the stomach to the small intestine
Pyloric Sphincter
Finishes the Process of Chemical Digestion
Small Intestine
Sections of the Small Intestine
Duodenum, Jejunum, Ileum
Where do the intestinal mucosa, pancreatic, gallbladder, and liver add their secretions?
In the duodenum
What does intestinal mucosa add?
enzymes that hydrolyze carbs to monsaccharides (maltase,lastase, sucrase) and also hydrolyze proteins (peptidases)
The duodenum itself secretes ___ in response to____
Secretin in response to the acidity of chyme, which then stims the pancreas to release pancreatic juice. Also CCK (Cholecystokinin)in response to chyme
The use of pnacreatic juice?
Enzymes of small intestine desire a slightly basic pH, pancreatic juice has a high concentration of bicarbonates
Pancreas Secretions?
Pancreatic Juice, Trypsinogen (converts chymotrypsin), Chymotrypsin (cleaves sepcific peptide bonds in proteins)