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  • Created by: Rachel
  • Created on: 31-03-13 15:01

Why is blood so important?

  • An adult has about 5 litres of blood. Although blood is liquid, it is also an organ containing many different types of specialised cells that carry out particular functions in your body
  • These have all differentiated from blood stem cells and become specialised 

The composition of blood

  • Blood is made up of four main components: plasma, red blood cells, white blood cells and platelets
  • Plasma is a yellow liquid. It transports dissolved substances such as carbon dioxide, food substances and hormones
  • Red blood cells contain the red pigment haemoglobin. Haemoglobin can combine reversibly with oxygen to form oxyhaemoglobin:

haemoglobin + oxygen = oxyhaemoglobin

  • When blood passes through the lungs the haemoglobin combines with oxygen


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