The need for energy
Blood is a pale yellow liquid called plasma with red blood cells, white blood cells and platelets suspended in it.
Red blood cells contain a dark red chemical called haemoglobin [haemoglobin: the red protein found in red blood cells that transports oxygen round the body] . Haemoglobin combines with oxygen in the lungs to form a bright red chemical called oxyhaemoglobin. When the blood gets to places where oxygen is being used up oxyhaemoglobin releases the oxygen and turns back into haemoglobin.
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