Digest
Terms
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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)