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Self-Assessment Questions


Answer 6
  1. Brain stem. Increased intravesical pressure is the stimulus responsible for initiating a bladder contraction. This stimulus is sensed by the cerebral cortex, and the center of the micturition reflex is in the brain stem. Bladder contraction is a coordinated neuromuscular action characterized by the following events: relaxation of the external (striated) sphincter, decrease in urethral pressure, increase in detrusor pressure, opening of the bladder neck, and voiding.

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