What initiates the micturition reflex?
A) The external urethral sphincter relaxes.
B) Stretch receptors in the wall of the urinary bladder signal the sacral region of the spinal cord.
C) Parasympathetic efferent fibers stimulate the contraction of the detrusor muscle.
D) The internal urethral sphincter relaxes.
Answer: B
Anatomy & Physiology
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