Normally the nutrients that I mentioned over the past week circulate in the blood stream and go where they are needed. One of the things that we require to do anything is power or energy. When your muscles start to work, they require energy. Energy can be supplied by glucose which is either stored in your muscles as glycogen or it can be brought to the muscle via the blood.
In order for your body to convert the glucose into energy, the body must also supply oxygen, which comes via the blood stream.
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