Stem cells

• Differentiation is the process by which a cell changes to become specialised for its job
• Palisade Leaf Cell - photosynthesis in plants

  • Lots of chloroplasts
  • Tall = High SA = Absorbing CO2 into the leaf
  • Thin = Lots fit in to a small place
• Sperm - Male DNA -> Female DNA

  • Long tail + Streamlined head = swimming
  • Lots of mitochondria = Lots of energy
  • Enzymes in head = digest through the egg cell membrane
• Stem cells can differentiate into different types of cells.

  • Embryonic stem cells
  • Adult stem cells
• Embryonic- found in early human embryos


  Pros:

  • Can differentiate into any kind of cell

  Cons:

  • Higher chances of rejection
• Adult stem cell - found in bone marrow


  Pros:

  • No rejection

  Cons:

  • Less cells it can differentiate into