AQA Biolog- levels of organisation

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  • levels of organisation
    • specialised cells
      • cells are basic building blocks of all living organisms.
      • cells differentiate to form different types of cells.
      • most types of animal differentiated at an early stage but many types of plants cells differentiate whenever.
      • signs of cell differentiating:
        • changing shape
        • sub-cellular structures to develop to let it carry out a certain function.
      • in plants:
        • xylem
        • phloem
        • root hair cells
    • tissues, organs and systems
      • cells are organised into tissues
        • tissues are group of cells with similar structure and function which work together to do a job.
        • what tissues do:
          • muscle  tissue contracts to produce movement
          • glandular tissue produces substances substances such as enzymes and hormones
          • epithelial tissue covers organs
      • organs are groups of different tissues which all work together to perform a specific job.
        • organs are organised into organ systems which are groups of organs working together.

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