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How & where does oxygen & glucose enter the body externally? &how do they transport to cells & get into cells?
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Energy is made from oxygen and glucose, when reacted together. Oxygen enters the body via the respiratory system and glucose enters through the digestive system. These two systems link as they both provide the formulae for energy. When glucose and oxygen are both in the body, the cardiovascular transports it to the blood to the place in which it is needed in the body, for example the muscles. This is also links with the digestive and respiratory system as it provides the transportation of the energy.
oxygen is breathed in through the lungs where red blood cells grab it and transport it to cells. The by-product CO2 is then grabbed by red blood cells and expelled out of the lungs when you breath out.
glucose is sugar. So sugar is eaten, goes through digestion and is absorbed into the blood stream in the small intestine. It floats in the blood and is absorbed by cells with the help of insulin.
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