Hydrolysis of phosphocreatine, anaerobic glycolysis, aerobic respiration
Explanation:
Under active condition the readily available source of ATP is needed by the muscle to fulfill the energy requirements.
Phosphocreatinine is a molecule that stores energy and recharges ADP to ATP during muscle contraction. So, hydrolysis of phosphocreatinine is the first mechanism that is employed.
Since anaerobic glycolysis does not require oxygen.The muscle cells find it convinient mechanism to generate ATP by using up the glucose. Thus , this is the second mechanism which is employed.
Glycolysis is the last mechanism employed to generate ATP because this process needs a complete supply of oxygen. Which depends on the availability and diffusion rate of oxygen into the tissues.
