Bless you.  What's that?  You didn't sneeze?  Well, let's pretend you did.  While your lungs and nose were involved, it was your immune system telling the nervous system to make a sneeze happen: air intake, lungs contract with force, throat open, yada..yada…. The immune system sensed a possible invader or cell/pathogen/mucous that needed expelled from the body and ordered up a sneeze that the nervous system made happen.