What are the phases of normal bladder function?

Updated: Dec 06, 2018
  • Author: Bradley C Gill, MD, MS; Chief Editor: Edward David Kim, MD, FACS  more...
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Answer

Answer

Normal bladder function consists of 2 phases: filling and emptying. The normal micturition cycle requires that the urinary bladder and the urethral sphincter work together as a coordinated unit to store and empty urine. During urinary storage, the bladder acts as a low-pressure receptacle, while the urinary sphincter maintains high resistance to urinary flow, in order to keep the bladder outlet closed. During urine elimination, the bladder contracts to expel urine while the urinary sphincter opens (low resistance) to allow unobstructed urinary flow and bladder emptying.


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