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Science

Organs in animals

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The digestive system

Organ systems are groups of organs that carry out a particular function. The human body has several organ systems, including:

  • The nervous system
  • The respiratory system
  • The reproductive system
  • The digestive system

The digestive system is an example of an organ system in which humans and other mammals exchange substances with the environment. The table shows its main tissues and organs, and their functions:

Part(s)Function
Pancreas and salivary glandsProduce digestive juices
StomachDigests food
LiverProduces bilebile: A substance produced in the liver. It emulsifies fats to prepare them for digestion.
Small intestineDigest and absorb soluble food
Large intestineAbsorbs water from undigested food, producing faeces

You should be able to recognise the organs of the digestive system on a diagram.

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Back to Tissues, organs and organ systems index

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