When the external sphincter contracts around the ureter, the bladder relaxes and releases urine.

When the external sphincter contracts around the ureter, the bladder relaxes and releases urine.

• A. True
• B. False
• C. Not applicable
• D. Partially true

Answer: (B)

Urination is controlled by the detrusor muscle of the bladder and the external urethral sphincter. The external sphincter surrounds the urethra, not the ureter, so contracting it would close the urethra and prevent urine flow rather than affect the ureter. For urine to be released, the detrusor must contract and the external sphincter must relax, allowing urine to exit through the urethra. The bladder stores urine by remaining relaxed during filling, and only contracts during voiding. There isn’t a sphincter around the ureter to regulate its flow. Therefore the statement is not correct.

Urination is controlled by the detrusor muscle of the bladder and the external urethral sphincter. The external sphincter surrounds the urethra, not the ureter, so contracting it would close the urethra and prevent urine flow rather than affect the ureter. For urine to be released, the detrusor must contract and the external sphincter must relax, allowing urine to exit through the urethra. The bladder stores urine by remaining relaxed during filling, and only contracts during voiding. There isn’t a sphincter around the ureter to regulate its flow. Therefore the statement is not correct.