Cell Organisation

• large multicellular organisms are made up of organ systems

  • cells make up living organisms, some cells are specialised.
  • the process of them being specialised is called differentiation (occurs during the development of a multicellular organism)
  • these specialised cells form tissues, which form organs, which form organ systems
  • large multicellular structures have different systems inside them for exchanging/ transporting materials
• similar cells are organised into tissues

  • a tissue is a group of similar cells that work together to carry out a particular function. types of tissue:
  • muscular - contacts to move whatever it's attached to
  • glandular - makes/secretes chemicals like enzymes/ hormones
  • epithelial - covers parts of the body e.g. inside the gut
• tissues are turned into organisms

  • an organ is a type of different tissue that works together to perform a certain function
  • muscular - moves stomach wall to churn up the food
  • glandular - makes digestive juices to digest food
  • epithelial - covers the outside and inside of the stomach
• organs are organised into systems

  • organ system is a group of organs working together
  • for example the digestive system
  • glands - produce digestive juices
  • stomach/ small intestine - digest food
  • liver - produces bile
  • small intestine - absorbs soluble food molecules.
  • large intestine - aborbs water from undigested food, leaving poo