specialised cells

• specialised cells: a cell that is adapted to carry out a specific function
• SPERM CELLS:

  • have a tail to swim to the egg cell
  • many mitochondria to release energy for movement
  • a streamlined shape and enzymes in the acrosome in the head to penetrate the egg cell
• EGG CELLS:

  • have a jelly layer surrounding the cell
  • after fertilisation, the layer hardens to prevent other sperm from entering
  • cytolplasm is filled with nutrients
• EPITHELIAL CELLS:

  • line tubes such as the trachea
  • have a lot of cillia to move mucus containing dirt and bacteria away from the lungs
  • also found in the oviducts, moving things across the cell surface.
• SMALL INTESTINE CELLS (VILLI):

  • found where digested food is absorbed
  • finger like extensions which increase the surface area of the small intestine.