Cell organisation

• Large multicellular organisms are made up of organ systems
• Similar cells are organised into tissue

  Tissue is a group of similar cells that work together to carry out function. can include more then one type of cell

  eg human:

  • muscular tissue, contracts to move what it’s attached to
  • glandular tissue- makes secretes chemicals like enzymes and hormones
  • epithelial tissue, covers some parts of body eg inside of gut
• Tissues are organised into organs 


  An organ is a group of dif tissues that work together to perform certain function

  eg stomach:

  • muscle tissue moves the stomach to churn the food
  • glandular tissue, makes digestive juices to digest food
  • epithelial tissue, covers the outside and inside of the stomach
• Organs are organised into a organ system 


  An organ system is a group of organs working together to form a particular function

  eg digestive system:

  • glands( pancreas/ salivary gland) which produce digestive juices
  • stomach and small intestine which digest food
  • the liver produces bile
  • small intestine absorbs soluble food molecules
  • large intestine absorbs water from undigested food leaving faeces