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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

Digestive System

Chapter #2

Extension

digestive system1
Digestive System
  • Large complex molecules broken down into simpler molecules
  • Long tube beginning with mouth and ending with the anus
digestive systems
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
digestive system2
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
simple stomach
Simple Stomach
  • Muscular contractions break down food
  • Enzymes break down food:
    • Gastric: proteins
    • Liver & Pancreatic: fats
ruminant stomach
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
ruminant stomach1
Ruminant Stomach
  • Omasum (many plies): 8% of stomach, absorbs water
  • Abomasum (true stomach): 8% of stomach, typical enzyme activity
  • Rumination: regurgitation, rechewing of food
digestive system3
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
digestive system4
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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