Review Question - QID 213629

A 51-year-old woman presents to her primary care physician with a 6-month history of urinary problems. Specifically, she says that she has had several embarrassing episodes where she urinated during a meeting at work. She says that she felt the urge to urinate but she was not able to make it to the bathroom in time. She also has experienced nighttime urges to urinate that disrupt her sleep. About one-third of these episodes she says that starts urinating in bed before she is able to start going to the bathroom. Her past medical history is significant for diabetes and fibroids. She has 3 living children all of whom were delivered vaginally. Which of the following mechanisms is most likely responsible for this patient's symptoms?