1. NOTES – DIGESTIVE SYSTEM ANATOMY

2. Within 2-6 hours, all food is emptied into the small intestine. After you eat how long does it take for the stomach to empty? Interesting Digestive System Facts

3. 1,100 How many pounds of food does the average person eat in a year?

4. about 20-30 ft long. How many feet long are your intestines?

5. NOTES – DIGESTIVE SYSTEM ANATOMY Oral Cavity mouth, pharynx, esophagus

6. MOUTH SALIVARY GLANDS – produce saliva

7. Saliva Components Mostly water – about 99.5% SALIVARY AMYLASE – digests starch LYSOZYME – antibacterial action MUCIN – lubricant chewing and saliva with food form a BOLUS

8. PHARYNX Epiglottis prevents food from entering the trachea (wind pipe) common area for food and air

9. ESOPHAGUS transports bolus from pharynx to stomach involuntary muscular movement of food - PERISTALSIS

10. STOMACH a storage & mixing chamber secretions mucus hydrochloric acid (HCl) HCl activates pepsinogen to pepsin which is main enzyme that digests protein

11. movement mixing waves - peristalsis bolus becomes chyme

12. SMALL INTESTINE parts: duodenum, jejunum, ileum Function: digestion and absorption intestinal juice – water & mucus epithelial cells have digestive enzymes to digest ALL classes of food

13. LIVER performs many functions – main blood filter in digestive system in digestion it secretes BILE into the gall bladder the gall bladder then dumps bile into small intestine

14. bile EMULSIFIES fats – breaks fat into smaller pieces – easier for fat digesting enzymes to do their work Normal liverfatty liverCirrhosis of the liver

15. PANCREAS pancreatic enzymes are important for the digestion of all major classes of food four enzymes and bicarbonate all are dumped into small intestine

16. LARGE INTESTINE Parts: ascending colon, transverse colon, descending colon, sigmoid colon chyme is converted to feces absorption of water & salts E. coli bacteria synthesizes vitamin K