blood cells

• production of blood cells: red bone marrow produces red blood cells (RBC) and white blood cells (WBC)
• red blood cells carry oxygen
• white blood cells fight pathogens
• name the organelles missing from a red blood cell

  nucleus and mitochondria
• why does a red blood cell have no nucleus

  more space to carry oxygen
• name the special shape of a red blood cell

  biconcave
• why does a red blood cell have a biconcave shape

  large surface area to absorb more oxygen
• what is the name of the protein that oxygen binds to?

  haemoglobin
• why does a red blood cell have lots of haemglobin?

  to bind lots of oxygen