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Digestive System

Digestive System. Chapter #2 Extension. Digestive System. Large complex molecules broken down into simpler molecules Long tube beginning with mouth and ending with the anus. Digestive Systems. Man & Pig have a simple stomach with an extensive intestinal system

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Digestive System

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  1. Digestive System Chapter #2 Extension

  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 ringlike 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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