AQA Biology AS unit 1: Enzymes and digestion

Glands in the digestive system produce enzymes that break down large molecules into small ones ready for absorbtion.

Major parts of the digestive system:

  • The oesophagus: adapted for transport and has a thick, muscular wall.
  • The stomach: produces enzymes and mucus, stores and digest food (esp. proteins)
  • The small intestine: further digests food with enzymes, large surface area for absorbtion.
  • The large intestine: absorbs water. (food within the large intestine therefore form into faeces) 
  • The rectum: store faeces before being periodically removed by the


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