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The digestive system
The digestive system
The digestive system
The digestive system
The digestive system
The digestive system
The digestive system
The digestive system
The digestive system
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The digestive system

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Transcript

  • 1. The Digestive System
    Esophagus
    Stomach
    Small Intestine
    Liver
  • 2. Esophagus
    Muscular tube, lined with moist stratified squamous epithelium that extends from the pharnyx to the stomach.
    25 Cm Long
    Transports food from the pharnyx to the stomach
    Upper and lower esophageal sphincters are located at the upper and lower ends of the esophagus.
  • 3. Esophagus (continued….)
    Esophageal sphincters regulate the movement of food into and out of the esophagus.
  • 4. Stomach
    Enlarged segment of the digestive tract in the superior part of the abdomen
    Lined with simple columnar epithelium.
    Storage and mixing chamber for ingested food
    Regulates secretions and could be divided into 3 phases.
  • 5. Stomach (continued……)
    Cephalic Phase- sensations of taste, the smell of food, stimulation of the tactile receptions during the process of chewing and swallowing.
    Gastric Phase- period during which the greatest volume of gastric secretion occurs
    Intestinal Phase- primarily inhibits gastric secretions
  • 6. Small Intestine
    6 meters long
    Duodenum-25cm long
    Jejunum-2.5 m long
    Ileum-3.5m long
    Major site of digestion and absorption of food
  • 7. Small Intestine (continued….)
    Major function is absorption of nutrients
    Most occurs in the duodenum and jejunum
    Mixing and propulsion of chyme occurs here
  • 8. Liver
    Weighs about 1.36 kilograms
    Located in the right upper quadrant of the abdomen
    Divided into right lobe and left lobe
    Stores and processes nutrients, detoxifies harmful chemicals
  • 9. Liver (continued…..)
    Synthesizes new molecules
    Neutralizes stomach acid by increasing the efficiency of fat digestion and absorption.

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