Oxygen enters the body through the lungs and it is carried about the body by red blood cells. The oxygen transfers across the walls of the lung easily as the lining of the lungs is very thin. Red blood cells contain a protein called haemoglobin which can bind and carry oxygen.
Glucose is absorbed from the digestive system into the blood. Blood carries glucose around the body and it utilises a protein called GLUT to get inside our hungry cells as it’s not able to pass through the cell by itself.