Question

Micturition is

• A. process of release of urine
• B. Central nervous system initiating the contraction of urinary bladder
• C. Central nervous system initiating the relaxation of urethral sphincter
• D. None of the above

Answer 1

The correct option is A process of release of urine

The urine formed in the kidneys is transported to the urinary bladder. As the bladder becomes full, the stretch receptors send a message to central nervous system. The central nervous system initiates the contraction of bladder and simultaneous relaxation of urethral sphincter. This coordinated and sustained contraction of the detrusor muscle along with simultaneous relaxation of the urethra is micturition reflex. This leads to the release of urine from the urinary bladder. This process is called micturition.