Third energy system

This energy system uses oxygen.

The first step is that it bring oxygen into the muscles where glucose is but when we run out of glucose then we use fat instead because we need to create energy to survive so we burn fat. Where then 2 ATP molecules and lactic acid that goes to the next step

The second step is Kreb cycle where everything reacts and creates 2 ATP, carbon dioxide and also hydrogen because the hydrogen is used in the next part to create a large amount of ATP. The hydrogen then goES to the next step.

The third step is called the electric transport chain some are negative and positive charged. What happens is that hydrogen then reacts with the oxygen to creates 34 ATP molecule.

The sports that se this energy system are;
Football
600 meter
Marathon