Specialised Cells

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  • Specialised Cells
    • Palisade Leaf Cells
      • Adapted for Photosynthesis, as they are packed with Chloroplasts
      • Chloroplasts crammed at the top of the cell- near light
      • Tall shape- lot of surface are exposed down the side for absorbing CO2
      • Thin shape
        • Chloroplasts crammed at the top of the cell- near light
    • Guard Cells
      • Open and close the stomata
      • Lots of water- guard cells are full and go plump and turgid- stomata opens so gases can be exchanged for photosynthesis
      • Short of water- guard cells lose water and become flaccid- stomata closes to stop too much water vapour escpaing
      • Thin outer walls and thickened inner walls
      • Sensitive to light and close at night to save water
    • Red Blood Cells
      • Concave shape= big surface area for absorbing oxygen
        • Therefore pass smoothly through capillaries
      • Packed with haemogoblin
      • No nucleus
        • Packed with haemogoblin
    • Sperm and Egg Cells
      • Specialised for reproduction
      • Egg cell- nourish the developing embryo in the early stages
      • Sperm cell- male DNA to the female DNA, a lot of mitochondria= energy, long tail and a streamlined head to help it swim to the egg
      • When sperm fuses with the egg, the egg's membrane instantly changes to stop any more sperm getting in- make sure offspring ends up with the right no. of chromosomes


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