Digestive system
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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

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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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