digestive and excretory system n.
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Digestive And excretory system. By Justin wade™. The four stages of digestion. Ingestion-Taking in nutrients Digestion-using physical and chemical means to break down food into small usable parts Absorption-pulling molecules into cells then into blood

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Presentation Transcript
the four stages of digestion
The four stages of digestion
  • Ingestion-Taking in nutrients
  • Digestion-using physical and chemical means to break down food into small usable parts
  • Absorption-pulling molecules into cells then into blood
  • 4. Egestion-the removal of waste food materials
mouth
mouth
  • -Your mouth uses chemical and mechanical digestion
  • -Mechanical is when you use your teeth and tongue to chew
  • -The small pieces of food you chewed are called bolus
  • -saliva contains enzyme called amylase, which breaks down the bolus using chemical digestion http://www.nlm.nih.gov/medlineplus/mouthdisorders.html

Tonsils

Help prevent infection in nose

Teeth

Used for chewing food

Tongue

Helps swallow

Opening of salivary gland

esophagus
Esophagus
  • -The pharynx is where your airway and the rest of your digestive system meet
  • -The epiglottis covers the airway tube
  • -When you swallow food the flap blocks the air way so the food goes to the stomach

http://knowledgeserver.wordpress.com/2011/08/15/pharynx/