Answer:
completed part.
In order for urination to occur, the __urethral sphincters___ must relax and the _detrusor __muscles ___ must contract.
Generally micrrution relex causes bladder contraction, during emptying of urine, through neural pathway.
Parasympathetic stimulation causes the contraction of detrusor muscles,after reception of stimulus from the distention of the bladder.
The stimuli caused the internal urethral sphincters to relax.
The sequence of events is followed by relaxation of the external urethral spincthers,which is under somatic controls,and therefore can be voluntarly controlled by induviduals.
Step-by-step explanation: