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Stages of Digestion. Four Stages of Digestion. Ingesting Digesting Absorbing Eliminating. Stage 1:Ingesting. The starting point of the digestion process. . Stage 2: Digesting. Mouth: Mechanical and Chemical digestion begins.

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Presentation Transcript
four stages of digestion
Four Stages of Digestion
  • Ingesting
  • Digesting
  • Absorbing
  • Eliminating
stage 1 ingesting
Stage 1:Ingesting
  • The starting point of the digestion process.
stage 2 digesting
Stage 2: Digesting
  • Mouth: Mechanical and Chemical digestion begins.
  • Mechanical digestion is the chewing and breaking food down into smaller pieces
  • Each small piece of food is a bolus
  • Saliva lubricates the food, and contains an enzyme, called amylase.
  • Chemical digestion occurs when amylase begins to break down complex carbohydrates.
slide5
Esophagus: as food passes through the pharynx, the epiglottis covers the airway tube.
  • The food moves on to the esophagus.
  • The esophagus is a tube that connects the pharynx and the stomach.
slide6
The esophagus is long and muscular
  • The bolus is pushed through the esophagus in a process called peristalsis.
stomach
Stomach
  • Your stomach is like a stretchable muscular bag.
  • Inside the stomach is gastric juice, which is very acidic.
  • The stomach walls are lined with mucus, that protects the tissue.
  • Pepsin is an enzyme which breaks down protein, and needs an acidic environment.
  • The bolus breaks down into a liquid called chyme.
small intestine
Small Intestine
  • Once the chyme leaves the stomach, it empties into the small intestine.
  • The first metre is called the duodenum. Digestion is complete after foods leaves.
  • Within the first 30 cm are ducts that connect to other organs.
  • Pancreas: produces enzymes
  • Liver: produces bile.