Tissues organs and systems

  • Created by: aryan26
  • Created on: 08-04-19 12:03
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  • Tissues, organs and systems
    • A tissue is a group of cells that are specialised to work together to carry out a particular function
      • Animal tissues
        • Squamous epithelium- single layer of flat cells lining the surface
        • Ciliates epithelium- found on surfaces where things need to be moved
        • Muscle tissue- bundles of elongated cells called muscle fibres
          • Smooth- in stomach wall
          • Cardiac- in the heart
          • Skeletal- use to move
        • Cartilage- connective tissue in joints. Shapes and supports ears, nose and windpipe
          • Formed when chondroblasts secrete an extracellular matrix which they become trapped inside
    • Plant tissues
      • Xylem: transports water and provides support. Contains hollow xylem vessel cells, which are dead and living parenchyma cells.
      • Phloem: transports sugars. Arranged in tubes and is made up of sieve cells, companion cells and ordinary plant cells.
        • Each sieve cell has end walls with holes in, so sap can move easily- these are called sieve plates
    • Organs
      • An organ is a group of different tissues that work together to perform a particular function
      • Organs work together to form organ systems- each system has a particular function
        • The respiratory system- made up of all the organs, tissues and cells involved in breathing
        • The circulatory system is made up of all the organs involved in blood supply
      • The lungs: contain squamous epithelial tissue, ciliates epithelial tissue, elastic tissue and vascular tissue
      • Leaves: contain palisade cells as well as epidermal tissue an xylem and phloem tissues in the veins

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