And so what happens is when the cell contains a low level of ATP compared to amp, the ANP adenosine monophosphate will actually act as an allosteric activator of phosphorase B. It will bind to an allosteric site on phosphorase B in the T state because the T state is the state that predominates for phosphorase B. And what it does is it basically shifts the equilibrium towards the r state. It opens up the activity and that causes, it increases the activity of this phosphorase B. And so what that will do is it will stimulate the phosphorlase B to actually go on and break down the glycogen into glucose molecules to form more ATP. Now in addition, sudden or strenuous activities such as for instance sprinting will basically stimulate the release of specific hormones, for instance epinephrine.