1. Digestive System Original Power Point Created by Casey Osksa
Modified by Georgia Agricultural Education Curriculum Office
June 2002

2. Digestion Large complex molecules broken down into simpler molecules
Long tube beginning with mouth and ending with the anus

3. Digestive Systems
Man & Pig have a simple stomach with an extensive intestinal system
Ruminants have a complex stomach with a simpler intestinal system
Horses & Rabbits have a simple stomach with an extensive intestinal system and an enlarged cecum

4. Digestive System Mouth: “Prehension” tool (grasps food)
Salivary Glands secrete juices containing enzymes (digest food)
Chewing food breaks down also
Esophagus: muscular tube that connects mouth to stomach
Peristaltic Movement:
sequential contraction of ring like muscles
Reverse Peristalsis = blowing chunks

5. Simple Stomach Muscular contractions break down food
Enzymes break down food:
Gastric: proteins
Liver & Pancreatic: fats

7. Ruminant Stomach
Stomach occupies 3/4 of abdominal cavity, mostly on the left side
Rumen (paunch): 80% of stomach, lighter food collects here
microbes digest cellulose
lots of water
Reticulum (hardware stomach): 5% of stomach, heavy foreign items are trapped here

8. Ruminant Stomach Omasum (many plies): 8% of stomach, absorbs water
Abomasum (true stomach): 8% of stomach, typical enzyme activity
Rumination: regurgitation, rechewing of food

10. Digestive System
Small Intestine: long coiled tube connecting stomach to large intestine
rest of the digestion and absorbtion takes place here
surface covered with villi (surface area)
Large Intestine: Cecum, colon, rectum
absorbs water (makes feces more solid)
some vitamins & minerals absorbed here
Cecal Fermenters (Horse): similar to rumen

11. Digestive System Accessory organs:
Pancreas secretes enzymes to break down fat
Liver (largest internal organ) secretes bile, which digests fats
also stores iron