How does the parasympathetic nervous system affect the bladder and urethra?

The parasympathetic nervous system promotes bladder contraction and relaxation of the urethral sphincter, facilitating voiding. This system is responsible for the restorative functions of the body, including processes related to digestion and elimination.

The parasympathetic nervous system has specific effects on the bladder and urethra by causing the contraction of the smooth muscle in the bladder wall while simultaneously relaxing the urethral sphincter. This coordinated action promotes the process of voiding, allowing urine to be expelled from the bladder. The parasympathetic division's role in these functions is part of its broader restorative function, which includes the activation of processes related to digestion and elimination.