Its only divided into 2 parts, the somatic nervous system and the autonomic nervous system.
Refractory Periods (Absolute) The cell cannot accept another impulse because it's still dealing with the last one. Absolutely no stimulus, no matter how strong, will result in another depolarization.
Question 1: (Do you avoid tobacco products?)
Question 2: (How often do you catch a cold?)
you said 2 right?
Check exactsports.com you might find answers there.
