Well, basically the active PKA goes on and phosphorylates specific amino acids such as three an proteins and enzymes. And what that does is it activates those molecules. So two important things that PKA does is the following. Number one, PKA basically activates enzymes which are responsible for breaking down glycogen into glucose. And then our cells can use the glucose to basically form ATP molecules. And for instance, if we're discussing muscle cells, if this is the membrane of a muscle cell, the ATP can then be used to contract that muscle.