Cells, tissues & organs

(B2 1)

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  • Cells, tissues and organs
    • Mitrochondria - Where most of the energy is released during respiration
    • Ribsomes - where protein synthesis takes place
    • Bacteria
      • v. small (can only be seen with electron microscope)
      • cell membrane/ wall surround cytoplasm
      • no nucleus so genetic material in cytoplasm
      • when multipy the form a colony (can be seen by naked eye)
    • Yeast
      • single- celled organism
      • have nucleus/ cytoplasm/ membrane
    • Specialised cells
      • cells specialised to carry out different functions
      • if cells has ribsomes, making a lot of protein e.g. glands cells (produce enzymes)
      • if tale, able to move e.g. sperm cells
      • if has mitochondria needs a lot of energy e.g. sperm/ muscle cells
    • Diffusion
      • diffusion is the spreading out of particles
      • net movement into/ out of cells depends on concentration of particles on each side of the cell membrane
      • high -> low concentration
      • the larger the concentration gradient, the faster the ROD
      • e.g. the D of simple sugars/ amino acids frpm gut through cell membranes
  • Organ system = a group of organs that perform a particular function
  • During the development of multicellular organisms the cells differentiate
    • Cells, tissues and organs
      • Mitrochondria - Where most of the energy is released during respiration
      • Ribsomes - where protein synthesis takes place
      • Bacteria
        • v. small (can only be seen with electron microscope)
        • cell membrane/ wall surround cytoplasm
        • no nucleus so genetic material in cytoplasm
        • when multipy the form a colony (can be seen by naked eye)
      • Yeast
        • single- celled organism
        • have nucleus/ cytoplasm/ membrane
      • Specialised cells
        • cells specialised to carry out different functions
        • if cells has ribsomes, making a lot of protein e.g. glands cells (produce enzymes)
        • if tale, able to move e.g. sperm cells
        • if has mitochondria needs a lot of energy e.g. sperm/ muscle cells
      • Diffusion
        • diffusion is the spreading out of particles
        • net movement into/ out of cells depends on concentration of particles on each side of the cell membrane
        • high -> low concentration
        • the larger the concentration gradient, the faster the ROD
        • e.g. the D of simple sugars/ amino acids frpm gut through cell membranes

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