- A Medulla
- B Sacral cord
- C Hypothalamus
- D Lumbar cord
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Answer:
B
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The micturition reflex is the process of bladder emptying. The sacral cord is where the reflex arc for micturition is located. The afferent signals from stretch receptors in the bladder travel to the sacral cord through the pelvic nerves. Then the sacral cord initiates efferent signals via parasympathetic nerves to the detrusor muscle to contract and via somatic nerves to the external urethral sphincter to relax. These signals facilitate the process of urine expulsion. Therefore, the correct option is B.
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