Gastrointestinal System
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Gastrointestinal System

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Gastrointestinal System Gastrointestinal System Presentation Transcript

  • Gastrointestinal System (Digestive System)
  • Purpose
    • Main Function:
      • Digest food and make nutrients available for the rest of the body.
  • Feedback loops
    • Muscles use energy
    • Brain tells GI system to Brake down food faster and make more energy available.
    • You feel “Hungry”
    • Need to replace used energy stores.
  • Mouth
    • Digestion begins
      • Saliva - Enzymes
      • Mastication
    • Prepares food for next voyage
  • Peristalsis
    • Muscular contraction in the GI system that moves food through the body
    • Reverse Peristalsis:
    • when food comes back out.
  • Esophagus
    • Tube that leads from Mouth to Stomach.
    • Lined with involuntary muscles
    • No digestion or absorption takes place here.
  • Epiglottis
  • Stomach
    • Begins chemical digestion
      • More enzymes and acids
    • Low pH levels, kill off bacteria
    • Mechanical digestion
      • Churning, squeezing
  • Heartburn
    • The heart is not involved.
    • When acid from stomach travels up the esophagus.
    • Esophagus is not protected from acid, and it begins to burn the lining of muscle.
  • Small Intestine
    • 22 feet long!
    • Further breakdown of food with bile.
    • Begins nutrient absorption.
    • 3 Parts
      • Duodenum
      • Jejunum
      • Ileum
  • Villi
    • Wrinkles in lining of small and large intestine
    • Purpose:
      • Increase surface area
    • Microvilli: each villus is covered in even smaller wrinkles
    • Purpose:
      • Increase surface area
  • Large Intestine
    • Most responsible for absorption
      • Water from indigestible food
      • Any nutrients the SI didn’t get
    • Rectum stores waste to be expelled through anus.
  • Summary
    • The GI system plays an important role in our bodies.
    • It provides the rest of the body with nutrients and energy.
    • It connects with the nervous system to inform us of when to eat.
    • The nervous system can also inform the GI system to prepare for incoming food.