Specialised Cells and Tissues

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  • Specialised Cells and Tissues
    • Specialised Cells have Special Features
      • Specialised cells are cells that carry out a specific function.
      • They have special features that help them to carry out this function.
      • For example, PALISADE LEAF CELLS carry out LOTS OF PHOTOSYNTHESIS. They contain LOTS OF CHLOROPLASTS, which are needed for photosynthesis.
    • Cells Differentiate to become Specialised
      • The process by which cell CHANGES to become specialised is called DIFFERENTIATION.
      • Differentiation occurs as a MULTICELLULAR ORGANISM (like you, me or a plant) DEVELOPS (grows).
      • SPECIALISED CELLS form TISSUES, which form ORGANS, which form ORGAN SYSTEMS.
      • LARGE MULTICELLULAR ORGANISMS have different SYSTEMS inside them for EXCHANGING and TRANSPORTING materials.
    • Similar Cells Make Up Tissues
      • A TISSUE is a GROUP of SIMILAR CELLS that work together to carry out a specific FUNCTION.
      • In MAMMALS (like humans), tissues include:
        • MUSCULAR TISSUE, which CONTRACTS (shortens) to MOVE whatever it's attached to.
        • GLANDULAR TISSUE, which MAKES substances like ENZYMES and HORMONES.
        • EPITHILIAL TISSUE, which COVERS some parts of the body, e.g. the INSIDE of the GUT.


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