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Digestive System
Digestive System basics
| Term | Definition |
|---|---|
| Digestive system | breaks down food into nutrients usable by cells |
| ingestion | take in |
| digestion | break down |
| absorption | take in, move into the body |
| elimination | removal |
| mechanical digestion | physical breakdown of food (chewing, churning) |
| chemical digestion | proteins called enzymes break down food into a different form |
| enzymes | proteins that help digestion |
| examples of 2 types of digestion in the mouth | mechanical digestion (chewing), chemical digestion (saliva) |
| saliva | breaks down carbohydrates with the enzyme Amylase |
| amylase | protein enzyme in saliva that breaks down carbs |
| esophagus | food tube: connects mouth & stomach |
| peristalsis | muscles of the esophagus contract and move food toward the stomach |
| examples of 2 types of digestion in the stomach | mechanical digestion (muscles squeezing & churning), chemical digestion (gastric acid and the enzyme pepsin) |
| pepsin | protein enzyme in the stomach that breaks down proteins |
| mucus | protects the inner layer of the stomach |
| chyme | what food is called when it leaves the stomach |
| small intestine | most digestion occurs here |
| villi | bumps (finger-like projections) that give more surface area for digested food to be absorbed into the body |
| liver | produces bile that breaks down lipids (fats) and filters blood |
| gallbladder | stores bile that gets released into the small intestine |
| secrete | give off /released |
| pancreas | releases protein enzymes insulin and glucagon into small intestine |
| insulin & glucagon | enzymes secreted into small intestine to regulate (control) blood sugar levels |
| large intestine | absorbs water from undigested material |
| colon | another name for large intestine |
| rectum | end of the large intestine |
| anus | muscular opening for removal of feces |
| feces | solid waste, end product of the digestive process |