Today was a pretty average day in biology.
- First we handed in our flow map which was homework
- Then we took notes on the organs of digestion
- After we introduced the emzyme and nutrient lab
Homework:
- Nutrient Pre-Lab due tomorrow
- Read 30.2 fir tomorrow
- Enzyme reading chart due thursday
- Visit Me Extra Credit by Tuesday next week
Here are the notes in case anyone missed them, the next scribe is Dana!
Digestion:
- breaks down large molecules into smaller molecules which can be used by cells
- Physical & chemical, alimentary canal- one way tube which food passes through body
- Acessory structures: dont carry food but aid in digestion
Mouth:
- Mechanical digestion- teeth crush food
- saliva moistens food and contains salivary amylase: turns starch into simpler sugars
Esophagus:
- Muscular- connects pharynx & stomach Perisatlisis-waves of muscle contractions
- bolus enters the stomach thru a sphincter, acid may back up into the esophagus
Stomach:
- Muscular sac lined w/ mucus ~ protection & lubrication
- mechanical digestion & chemical digestion
- HCI kills bacteria lowers pH to activate pepsin
- Peptic ulcer- hole in stomach wall: caused by bacteria
Small Intestine:
- Duodenum- 1st part of the small intestine, enzymes & fluids enter here
- Carbs, lipids, & proteins digested here, nutrients absorbed
- lined w/ finger like projections called villi- increase surface area for absorption
- water, cellulose, & indegestibles remain
Acessory Structures:
- Liner produces bile which emulsifies fat, gallbladder stores bile, & oancreas produces enzymes Large Intestine:
- absorbs water from undigested material & bacteria synthesize vitamin K
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