Here you will learn how oxygen is carried in our blood. This is an extension task for science.
Transportation of oxygen:
Even though oxygen can disolve in blood, only 1.5% of oxygen travels this way. Most oxygen in your body ( 98.5%) attached to a protein called haemoglobin.
Haemoglobin:
Haemoglobin is a protein found inside red blood cells made of four sub units. Each unit surrounds a heme group ( containing iron) and binds one oxygen molecule to the heme group. Each red blood cell can carry four oxygen molecules. Blood with higher amounts of oxygen being carried is bright red while lower oxygen levels are shown by darker blood.
It is easier for the second or third oxygen molecule to bind to the hemo group because with each added oxygen molecule the hemo group changes shape.
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