sperm cells, Nerve cells and Muscles cells

• Sperm cells are specialised (perform a specific function). Sperm cells are specialised to fertilise egg cells. To do this, they need to travel long distances relative to their size. They then break through to the egg cell and fertilise it.
• The ‘head’ contains the sperm cell’s nucleus. The nucleus carries one half of an organism’s genetic material.This combines with the egg cell's half of genetic material to fertilise the egg cell.
• • The middle section of the sperm cells is filled with mitochondria to provide the sperm with the energy it needs to travel a long distance to reach the egg cell.
• The acrosome is found at the tip of the head of the sperm cell. It contains the digestive enzymes needed to penetrate (break into) an egg cell.
• The flagellum (‘tail’) is used for the cell’s motion. This allows sperm cells to travel towards the egg cell.
• Nerve cells (or neurones) are specialised to transmit electrical messages around the body.
• one of the nerve cells key features are Axon

  • Part of the cell that electrical signals travel along.
  • Nerve cells have a long axon. This increases the distance that electrical signals can travel.
• one of the nerve cells key features are Myelin sheath

  • Branches of a nerve cell.
  • Several dendrites spread outwards from the cell body to transfer electrical messages to other neurons.
  • Electrical messages travel between neurons at synapses.
• one of the nerve cells key features are Dendrites

  • Branches of a nerve cell.
  • Several dendrites spread outwards from the cell body to transfer electrical messages to other neurons.
  • Electrical messages travel between neurons at synapses.
• Nerve cells transfer electrical signals around the body. These impulses travel very fast, and occur in a fraction of a second.
• A nerve cell, or neurone, is an animal cell. This makes it a eukaryotic cell
• Muscle cells are specialised (perform a specific function). They can produce force and motion.
• A muscle cell contains lots of mitochondria to generate lots of energy for motion.
• Protein fibres within the cell can contract, allowing the muscle to move.