I will try to give you the best answer by completing your statement.
During a marathon, approximately 99% of your muscles needs are met by the OES or Oxygen Energy System. Energy systems are the ones encharge of distributing the energy you need for a certain act.
They belong to buccal cavity which is a part of the digestive system.
Answer:
Proteins are macronutrients required for the function and regulation of all cells in the body.
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