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blood
red blood cells

 

  

Red blood cells

blood cell

They carry oxygen to all the tissues of the body
blood cell Your body has about 25,000,000,000,000 red blood cells
blood cell They are made in the bone marrow by blood stem cells
blood cell About 2,000,000 new cells are made every second
blood cell Red blood cells contain haemoglobin which binds oxygen
blood cell The iron in haemoglobin in the cells gives blood its red colour

 

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