1. NOTES – DIGESTIVE SYSTEM ANATOMY

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

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

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

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

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 liver
fatty liver
Cirrhosis 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