DIGESTIVE SYSTEM DIGESTIVE SYSTEM (27 FEET OF (27 FEET OF

GASTROINTESTINAL FUN)GASTROINTESTINAL FUN)

Parts and FunctionsParts and Functions

Parts of Digestive (GI) Tract

A. Mouth – breaks food into smaller pieces, mixes with slippery saliva

B. Pharynx – (throat) moves food from mouth

C. Esophagus – Squeezes food down to the stomach by using peristalsis –(muscle contractions to move food)

D.D. StomachStomach – squeezes the food, acid and enzymes break down food into soupy mixture called chyme

E.E. Small IntestineSmall Intestine – absorbs nutrients through villi (finger-like projections)

F.F. Large IntestineLarge Intestine – water is absorbed from undigested food

Parts of Digestive (GI) Tract

G. Rectum – stores waste

H. Anus – eliminates waste

Parts of Digestive (GI) Tract

More Parts…

A. Salivary Glands – amalyse breaks down carbohydrates

B. Liver – makes bile to breaks down fat, stores nutrients, breaks down toxins

C. Gall Bladder – stores bile from liver

D. Pancreas – makes neutralizing liquid and insulin

Mrs. Sime’s Top Five Things That Break It Down.

5. Saliva (amylase) – breaks down carbohydrates

4. Pepsin – breaks down proteins3. Insulin – breaks down sugar2. Bile – breaks down fats1. Will it be YOU?!?!?!?!--------------------------------------------------

What is being digested?

 Part

 Function

Muscles/ Enzymes Used and Function

Mechanical and/or

Chemical

 Sesame- Seed bun

Mouth ChewingStarts break down

food

Amylase: breaks down carbs Both

  Esophagus

Pushes food

Sphincter: prevents food from leavingPeristalsis: muscular contractionsEpiglottis: flap of tissue covers trachea

Mechanical

Beef pattiesCheese 

Stomach(3-6 hours)

Mixes foodHCl breaks down

food

Acid: mixes with food to make chyme Pepsin: breaks down proteins

Both

CheeseSpecial SauceLettucePicklesOnionsFat

Small Intestine(3-5 hours)*pancreas

*liver*Gall bladder

Absorbs of nutrients and puts into blood

stream

Villi: network of blood vessels Bile: breaks down fat Insulin: breaks down sugar

 Mechanical

** Accessory organs are Chemical

  Large Intestine(18-24 hours)

Absorbs leftover water in undigested food

  Mechanical