Hypercapnia

The last thing that you need to test is the a brain stem response to hypercapnia. The sensation of an elevated c o two detected by the dorcil respiritual group on the surface of the brain stem where it's bathed in c s f. This causes a reflex change in yor am, in spiritualy muscles. So your diaphragm reight and strength increases in contraction. Mike: Why did cranial nerve 11 always get us to the ball? Because he had good accessories.