some animal cells

• this very long cell carries nerve impulses

  
• Nerve cells can be called neurones
• neurones are long to be able to pass messages over long distances
• the letter: A

  
• dendrites enables neurones to pick up messages from other neurones
• The sheath around an axon allows messages to travel quickly
• ova are special cells because they are very large for a single cell
• sperm cells are special because they have tails
• sperm cells have tails so they can swim
• Letter: C

  
• Letter: B

  
• Letter: D

  
• Letter: A

  
• sperm cells have tails to swim
• sperm cells have an acrosome that releases enzymes to digest the egg membrane
• sperm cells have nucleus that contains genes
• sperm cells contain many mitochondria to rapidly release a lot of energy
• Ovas are large so that they can provide food for the embryo
• cells that line the wall are special because they have hairs called cilia
• the cilia that line our windpipes push dusty and dirty mucus out of the lungs
• the cells that line our windpipes are called epithelial cells