The autonomic nervous system has two divisions: Across 2. The parasympathetic nervous system whose purpose includes slowing down your heartbeat, lowering your blood pressure, and increasing blood flow to your skin. Down 1. The sympathetic nervous system whose function is the mobilization of the body’s nervous system due to fight or flight response. 3. The enteric nervous system which functions to regulate the basic visceral (organ) processes needed for the maintenance of normal bodily functions.