Cell Organisations

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  • Cell Organisation
    • Large multicellular organisms are made up of organ systems
      • The process by which cells become specialised for a particular job is called differentiation
      • Differentiation occurs during the development of a multicellular organism
      • These specialised cells form tissues, which form organs, which form organ systems
    • Similar Cells are organised into tissues
      • A tissue is a group of similar cells that work together to carry out a particular function
      • Examples of tissues include
        • 1)Muscular tissue, which contracts to move whatever its attached to
        • 2)Glandular tissues, which makes and secretes chemicals like enzymes and hormones
        • 3)Epithelial tissue, which covers some parts of the body (eg, inside of the gut)
    • Tissues are organised into organs
      • An organ is a group of different tissues that work together to perform a certain function
      • For example, the stomach is an organ made up of these tissues
        • 1)Muscular tissue, which moves the stomach wall to churn up the food
        • 2) Glandular tissue, which makes digestive juices to digest food
        • 3)Epithelial tissue, which covers the outside and inside of the stomach
    • Organs are organised into organ systems
      • An organ system is a group of organs working together to perform a particular function.
        • For example the digestive system breaks down food and is made up off these organs
          • 1)Glands which produce digestive juices
          • 2)The stomach and small intestine, which digests food
          • 3)The liver, which produces bile
          • 4)The small intestine, which absorbs water soluble food molecules
          • 5) The large intestine which absorbs water from undigested food, leaving faeces


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