The blood

• How may parts are there in blood ?

  4 parts , platelets, white blood cells , red blood cells ,and plasma
• What is the function of plasma ?

  Transports

  • digestion products (e.g.glucose)from the small intestine to other organs
  • carbon dioxide (from the organs to the lung )
  • waste products urea from the liver
• What is the function of red blood cells ?

  • transports oxygen from the lungs to body cells
• What adaptations do red blood cells have ?

  • contains the oxygen-carrying molecule,haemoglobin
  • no nucleus (more room for haemoglobin)
  • centre of the cell there are biconcave disc
• Why is there disc in the red blood cell ?

  gives greater surface area so that oxygen diffuses in and out faster
• What is the function of white blood cells ?

  they are part of the immune system ,making antibodies
• Features of the white blood cells

  • contains a nucleus (containing DNA,encodes instructions for white blood cells to do their job )
• What are platelets for ?

  they are tiny fragments of cells and they help the blood clot
• What is donated blood used for ?

  • to replace blood lost during injury
  • some people are give platelets extracted from blood to help clotting
  • protein extracted from blood can also be useful e.g. antibodies
• What do we need to make sure when donating blood ?

  • make sure the donated blood is the same blood type as the patient otherwise the the body immune system will reject the blood and the patient could die
  • lots of different diseases can be transmitted by blood