Biology 38.2
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Biology 38.2

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    Biology 38.2 Biology 38.2 Presentation Transcript

    • 38.2 The process of Digestion
    • Amylase
      Enzyme in saliva that breaks the chemical bonds in starches.
    • Esophagus
      Food tube connecting the mouth to the stomach.
    • Peristalsis
      Rhythmic muscular contractions that squeeze food through the esophagus into the stomach.
    • Stomach
      Large muscular sac that continues the mechanical and chemical digestion of food.
    • Chyme
      Mixture of stomach fluids and food produced in the stomach by contracting stomach muscles.
    • Small Intestine
      Digestive organ in which most chemical digestion takes place.
    • Pancreas
      Gland that produces hormones that regulate blood sugar; produces enzymes that break down carbohydrates, proteins, lipids, and nucleic acids; and produces sodium bicarbonate, a base that neutralizes stomach acid.
    • Liver
      Large organ just above the stomach that produces bile.
    • Villus
      Folded projection that increases the surface area of the walls of the small intestine.
    • Large Intestine
      Colon; organ that removes water from the undigested materials that pass through it.
    • Key Concept
      The digestive system includes the mouth, pharynx, esophagus, stomach, small intestine, and large intestine. Several major accessory structures, including the salivary glands, the pancreas, and liver, add secretions to the digestive system.
    • Key Concept
      The function of the digestive system is to help convert foods into simpler molecules that can be absorbed and used by the cells of the body.