Cell Organisation

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  • Cell Organisation
    • The process by which cells become specialised for a particular job is called differentiation.
    • Specialised cells form tissues, which form organs, which form organ systems.
      • e.g. Epithelial cells are organised into epithelial tissue, which forms the stomach, which forms part of the digestive system.
    • Similar cells are organised into tissues
      • A tissue is a group of similar cells that work together to carry out a particular function.
      • Muscular tissue contracts to move whatever it's attached to.
      • Glandular tissue makes and secretes chemicals like enzymes and hormones.
      • Epithelial tissue covers some parts  of the body.
    • Tissues are Organised into Organs
      • An organ is a group of different tissues that work together to perform a certain function.
      • Muscular tissue moves the stomach wall to churn up the food.
      • Glandular tissue make digestive juices to digest food.
      • Epithelial tissue 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.
      • The Digestive System
        • Glands (Pancreas and salivary glands) produce digestive juices.
        • The stomach and small intestines digest food.
        • The liver produces bile.
        • The small intestine absorbs soluble food molecules.
        • The large intestine absorbs water from undigested food, leaving faeces.
        • The digestive system takes in nutrients and releases substances.


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