Question

Urine formed by the nephrons is ultimately carried to the urinary bladder where it is stored till a voluntary signal is given by the

• A. CNS
• B. PNS
• C. ANS
• D. Endocrine system

Answer 1

The correct option is A CNS

The central nervous system is made up of the brain and spinal cord. The micturition reflex is one of the autonomic reflexes, but the release of urine is regulated by voluntary neural mechanisms that involve centers in the brain and spinal cord.
So a signal is initiated by the stretching of the urinary bladder as it gets filled with urine. In response, the stretch receptors on the walls of the bladder send signals to the CNS.The CNS passes on motor messages to initiate the contraction of smooth muscles of the bladder and simultaneous relaxation of the urethral sphincter causing the release of urine. The process of release of urine is called micturition and the neural mechanisms causing it is called the micturition reflex.