blood

• what do white blood cells do?

  They defend against infections.

  They are part of your immune system.
• less than 1% of blood contains what?

  White blood cells and platelets
• Red blood cells are also called..

  erythrocytes
• 5% of blood is made up of what?

  plasma
• haemoglobin+ oxygen= ?

  oxyhaemoglobin
• what colour are plasma/ what do they contain?

  straw coloured

  they contain red & white blood cells, platelets, food molecules (amino acids, glucose), waste products (like carbon dioxide and urea)
• what is plasma?

  a liquid that carries everything in the blood
• what do lymphocytes (a type of white blood cell) do?

  create antibodies and antitoxins
• 44% of blood is made of what?

  red blood cells
• why do people who live higher up need to produce more red blood cells?

  the high altitude means the air is thinner and so has less oxygen, red blood cells contain oxygen
• what is blood?

  a transport system
• what makes blood red?

  a protein called Haemoglobin (allows it to carry oxygen)
• what happens to white blood cells when there is an infection?

  they multiply
• what do white blood cells produce?

  antibodies-stop disease

  antitoxins-neutralise pathogens
• what does a lack of platelets cause?

  excessive bleeding and bruising
• what are platelets?

  small fragments of cells without nuclei
• do white blood cells have a nucleus?

  yes

  
• what is the name for the shape of red blood cells?

  biconcave disc

  
• do red blood cells have a nucleus?

  no because they need space for oxygen
• what do red blood cells do?

  they collect oxygen from the lungs and carry it around the body
• what do phagocytes(a type of white blood cell) do?

  they engulf pathogens (phagocytosis)
• what do platelets do?

  make your blood clot and stop microorganisms(eg. pathogens) from entering