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Digestive System

Digestive System. Original Power Point Created by Casey Osksa Modified by Georgia Agricultural Education Curriculum Office June 2002. Digestive System. Large complex molecules broken down into simpler molecules Long tube beginning with mouth and ending with the anus. Digestive Systems.

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Digestive System

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

  2. Digestive System • 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

  6. 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

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

  8. 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

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

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