1. MT: Digestive System
I will know the locations and functions of the major parts of the digestive system.

3. Major Parts of Digestive System
Mouth
Salivary glands
Esophagus
Stomach
Small Intestine
Large Intestine
Liver
Gallbladder
Pancreas

4. Mouth
Lips, cheeks, and tongue all have mucous membranes that secrete enzyme to break down food
Tongue and teeth used in mastication to start mechanical digestion

5. Salivary Glands Parotid glands: located under ears
Submandibular Glands: located under mandible in back
Sublingual Gland: located under tongue
They all secrete saliva which has enzymes to break down food
~1 liter of saliva a day

7. Esophagus Collapsible tube ~ 10 inches From mouth to stomach
Has layers of skeletal muscle on near throat and smooth muscle toward stomach

8. Stomach Stretchable pouch that can hold ~ 1 to 1.5 liters
2 sphincters close stomach off
Glands release hydrochloric acid in stomach (need sphincters to contain acid)
Muscle contracts to thrash food around and break into smaller pieces

9. Small Intestine ~ 22 feet long, 1 inch diameter of coiled tubes
Have villi (fingerlike projections) that increase the surface area for absorption of nutrients

10. Large Intestine ~ 6 feet long, 2.5” diameter
Parts: cecum, colon, rectum, anus
Absorb water from food to form feces
Secrete mucous to lubricate feces while defecating

11. Liver Large gland (3-4 lbs) 2 lobes; right lobe is bigger than left
Breaks down proteins, fat, & carbs
Stores iron, Vit A, B12, and D
Secretes bile (bile necessary to digest fat)
detoxifier

13. Gallbladder 3-4 inch green sac located underneath the liver
Secretes bile (bile helps body absorb fat)

14. Pancreas Grayish pink gland located near stomach and small intestine
Secretes enzymes to help with digestion
Secrete insulin ( a hormone that maintains blood sugar level.)