growth in animals

• Growth is an increase in size due to an increase of number of cells.
• Differentiation is the process by which a cell changes to become specialised for its job.
• Specialisation is a cell shich has adapted unique features to preform its function.
• Red blood cells:

  • Have a bioncave disk shape to give larger surface area.

  • Haemoglobin binds to oxygen which makes oxyhaemoglobin to release oxygen around the body.

  • No nucleus for more haemoglobin.
• Nerve cells:

  • Long axon to move impulses from one part of body to another.

  • Dendrites to contact other nerves.

  • Large number of mitochondria.

  • Myelin sheath insulates them.