How do the parasympathetic and sympathetic nervous systems work together to regulate the body's response to stress and relaxation?

The parasympathetic and sympathetic nervous systems work together to regulate the body's response to stress and relaxation. The sympathetic system activates the "fight or flight" response during stress, increasing heart rate and releasing adrenaline. The parasympathetic system then helps the body relax after the stress has passed, slowing heart rate and promoting digestion. Together, they maintain balance in the body's response to different situations.