B2.2 Tissues, Organs and Organ Systems

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  • B2.2 Tissues, Organs and Organ Systems
    • A tissue is a group of cells with similar structure and function.
      • muscular tissue, which can contract to bring about movement
      • glandular tissue, which can produce substances such as enzymes and hormones
      • epithelial tissue, which covers some parts of the body.
    • Organs are a group of different tissues working together to carry out a particular function.
      • The Stomach
        • muscular tissue, to churn the contents
        • glandular tissue, to produce digestive juices
        • epithelial tissue, to cover the outside and the inside of the stomach.
    • Organ systems are groups of organs that perform a particular function.
      • Digestive System
        • glands, such as the pancreas and salivary glands, which produce digestive juices
        • the stomach and small intestine, where digestion occurs
        • the liver, which produces bile
        • the small intestine, where the absorption of soluble food occurs
        • the large intestine, where water is absorbed from the undigested food, producing faeces.
    • Plant organs include stems, roots and leaves.
      • Plant Tissues
        • epidermal tissues, which cover the plant
        • mesophyll, which carries out photosynthesis
        • xylem and phloem, which transport substances around the plant.


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