PHYSCI 5 Lecture Notes - Lecture 13: Salivary Gland, Abdominal Cavity, Small Intestine
Digestive System
Digestive system - a processing place for food that
1. Digests food
a. digest= break down
a.i. starch→ glucose
a.ii. Proteins → amino acids
2. Absorbs
a. Move into blood circulation where cells can access
a.i. Cells that are large cannot move across the cell membrane
b. Mostly found in abdominal cavity
Organs of the digestive system
Main organs
- Mouth
- Esophagus
- Stomach
- Small intestine
- Large intestine
Accessory organs - called accessory because they doesn’t go through these but they excrete
chemicals that
- Salivary glands
- Pancreas
- Liver
- Gallbladder
Food processing and movement is due to contraction
Sphincter - when the valve closes, the food cannot move and when valve relaxes, food cannot
get from esophagus to the stomach. When the valve opens, food can
- Processing can be controlled
- Enzymes - chemical facilitators
- Reactants and products
- * what organ releases what and what’s the function
Enzymes
- Amylase converts sugar into smaller fragments
- Starch
- Salivary gland
- Stomach
- pepsinogen/pepsin
- Pancreas
- Pancreatic lipase
- Small intestine
Mouth
- Food + saliva → bolus
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PHYSCI 5 Full Course Notes
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Document Summary
Digestive system - a processing place for food that: digests food, digest= break down a. i. a. ii. starch glucose. Proteins amino acids: absorbs, move into blood circulation where cells can access a. i. Cells that are large cannot move across the cell membrane: mostly found in abdominal cavity. Accessory organs - called accessory because they doesn"t go through these but they excrete chemicals that. Food processing and movement is due to contraction. Sphincter - when the valve closes, the food cannot move and when valve relaxes, food cannot get from esophagus to the stomach. * what organ releases what and what"s the function. Carbs start breakdown, no protein or lipid breakdown yet. Release pepsinogen +hydrochloric acid pepsin will activate. Control how much food goes to small intestine. Small intestine - most important place for digestion (final destination of complete digestion and absorption) Bile - chemical needed for lipid breakdown (an emulsifier) Absorption in small intestine goes to bloodstream.
