Different Types of Tissues

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A tissue is - a group of similar cells that perform a particular function e.g. Epithelial tissues (which are animal cells that form sheets covering surfaces). Some examples of epithaelial tissues are the cilliated & squamous tissues

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Squamous Epithelia

  • One cell thick and so it is called simple epithelia
  • The cells are of one type and are smooth, flat and very thin
  • Packed closely together like tiles on a roof and provide a low friction surface over which fluids can move
  • Found in the lining of the cheeks, inside blood vessels, lining the chambers of the heart and forms the alveoli in the lungs


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Ciliated epithelia

  • Made up of cells with cilia and so is often found in areas where it is needed to transport something e.g. lining the oviducts and bronchioles of the lungs
  • Provides a short diffusion pathway for the exchange of of oxygen and carbaon dioxide
  • Sometimes the cells are shaped like cubes and the tissue is called cuboidal ciliated epithelia. If the cells are tall and narrow, it is referred to as columnar ciliated epithelia


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Xylem Tissue

  • Consists of xylem vessels with parenchyma cells and fibres
  • Walls become reinforced  and water proofed by deposists of ligin, this kills the cell contents
  • Xylem tissue well adapted for transporting water and minerals up the plant; it also helps to support the plant
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Phloem Tissue

  • Consists of sieve tubes & companion cells
  • Sieve plates allow the movement of of materials up or down the tubes
  • Companion cells metabolically active


  • Companion cells activities plays an important part in moving the products of photosynthesis up and down the plant in the sieve tubes


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Palisade mesophyll

  • Found in the leaf and is made up of one type of cell
  • The cells are tall and thin and are tightly packed together
  • Its function is to harness the light energy required for photosynthesis and so each cell is packed with chloroplasts.
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