How would you explain the connection between glucose entering the body and energy created by the body to a friend, using your biochemistry knowledge?

As glucose entered your body, it would have to undergo series of mechanism before it can generate energy. These mechanisms included the glycolytic pathway, the citric acid cycle, and the electron transport chain. Glucose is converted to pyruvate, which can be metabolized through one of the three processes, such as aerobic mechanism which produced ATP, anaerobic glycolysis (produced lactate), and anaerobic alcoholic fermentation (produced ethanol).

ATP is the energy source, which distributed throughout your body. Therefore it allow your body to move. Your body always requires energy whereever you go or whatever you are doing.