Digestive System

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Digestive System

• Chapter 2
• Extension

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Digestive System

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

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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

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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

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Simple Stomach

• Muscular contractions break down food
• Enzymes break down food
• Gastric proteins
• Liver Pancreatic fats

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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

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Ruminant Stomach

• Omasum (many plies) 8 of stomach, absorbs water
• Abomasum (true stomach) 8 of stomach, typical
  enzyme activity
• Rumination regurgitation, rechewing of food

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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

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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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