digestive system

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Author:
eli
ID:
148699
Filename:
digestive system
Updated:
2012-04-19 18:48:10
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digestive system
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digestive system
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  1. Functions of the digestive system
    1. ingestion
    intake to mouth
  2. Functions of the digestive system
    2.mechanical digestion
    • breakdown of particles
    • *Mastication-chewing
    • *Segmentation-mixing food and fluid w/in digestive tract
  3. Functions of the digestive system
    3.propulsion
    • moving food throught the digestive tract towards anus
    • *swallowing-voluntary/involuntary
    • *peristalsis-waves of muscular contraction to move food
  4. Functions of the digestive system
    4.chemical digestion
    breaksdown food into smallest particle by enzymes using carbs, protein, lipids,


    *happens in mouth stomach intestine
  5. Functions of the digestive system
    5.absorption
    • movement of particles into blood
    • *most nutrients occur in small intestines
  6. Functions of the digestive system
    6. defeccation
    elimination of waste
  7. structure of D.S.
    • oral cavity
    • pharynx
    • esophagus
    • stomach
    • small intestine
    • large intestine
    • rectum
    • anus
  8. Mesenteries
    1-falciform ligament
    suspends liver from diaphragm and anterior abdominal wall
  9. Mesenteries
    2-lesser omentum
    suspends stomach from liver
  10. Mesenteries
    3-greater omentum
    • fat apron over small intestine
    • suspends from stomach
  11. Mesenteries
    4-mesentery proper
    attaches small intestine to back wall of abdominal cavity
  12. Mesenteries
    5-mesocolon
    attaches large intestine to back wall of abdominal cavity
  13. mouth
    • -flexible lips and muscular cheeks hold food in
    • -Uvula guides food down pharynx
    • -strong tongue moves food over teeth for mastication
    • -teeth covered by enamel
  14. esophagus
    • -one foot long muscle tube moves food to stomach
    • -lined w stratified squamous epithelia
    • -uses peristalsis
    • -weak lower sphincter causing acids to move up to esophagus(acid reflux)
  15. stomach

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