Why? Well, because a single G alpha protein goes on and binds to a single adenylate cyclist and then that single cyclase enzyme carries out many individual processes in which it produces many of these cyclic Amp molecules. So we have a ton of these cyclic Amp molecules that then can diffuse into different regions in the cell. Now, what exactly is the function of CA and P? Well, camp can go on and basically stimulate many affector molecules and effectors can be enzymes or proteins or transcription factors. But inside our body, the most important job of CA and P, in this particular case in the epinephrine signal and transduction pathway is the fact that the cyclic Amp goes on and stimulates it activates protein kinase A molecules.