circulatory system - blood

• what do red blood cells carry

  oxygen from lungs to all cells in the body
• what shape is a red blood cell 


  biconcave disc ( gives a large surface area for absorbing oxygen )
• what do white blood cells do

  defends against infection
• what do white blood cells do

  produce antibodies and antitoxins
• what does a white blood cell have unlike a red blood cell 


  a nucleus
• what do platelets do

  help blood to clot at a wound to stop blood pouring out
• what is plasma 


  carries everything in blood . examples- red and white blood cells, co2 , urea, hormones, proteins