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Human Body

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					         Human Body

  The human body consists of major
  organs that have specific functions
required by the body to perform its life
               functions
                Digestive
• Mechanical and chemical breakdown of
  food into small molecules that cells can
  absorb and use
• Chapter 8, Section 2
The steps of Digestion
          Mouth
        Esophagus
         Stomach
      Small intestines
      Large intestines
     Rectum and anus
           Liver
        Gallbladder
         Pancreas
              Mouth


• Begins to break down food into smaller
  pieces through mechanical digestion
• Saliva in the mouth starts the process of
  chemical digestion
              Esophagus
• The transport tube that
  carries chewed food to
  the stomach
      Stomach
• Continues the process of mechanical
  digestion
• Secretes gastric juices that continue the
  process of chemical digestion started in
  the mouth
           Small intestines
• The organ where most of the chemical
  digestion of food takes place
• Nutrients from food are also absorbed
  through the small intestines
          Large intestines
• The organ where water is absorbed from
  the food and taken into the bloodstream
• Prepares the remaining undigested food
  for elimination from the body
          Rectum and anus
• The rectum is a short tube that stores solid
  waste until it eliminated from the body
  through the anus
                  Liver
• A secondary organ of the digestive system
  that produces bile
• Is used by the body to break up fat
  particles
              Gallbladder
• A secondary organ to the digestive system
  that functions to store bile produced by the
  liver
                Pancreas
• A secondary organ to the digestive system
  that functions to produce digestive juices
  that help to further break down the food in
  the small intestine
          Data Chart length of Organs
             in the Digestive Tract

         Organ                  Length (cm)
Mouth                     11

Esophagus                 25

Stomach                   22

Small Intestine           690

Large intestine           152

Rectum                    14
Moving Through the Digestive Tract
1. How do you think food moves through
   the digestive tract?
2. What do you think happens to food as it
   moves through the digestive tract?
3. Why do you think the digestive tract gets
   narrow at some places?

				
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posted:8/16/2011
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