PATHOLOGY MCQ
URINARY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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detrusor muscle, internal/external urethral sphincter
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internal/external urethral sphincter, detrusor muscle
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Either A or B
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None of the above
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Detailed explanation-1: -Micturition consists of a storage phase and a voiding phase. Stretch receptors in the bladder increase their firing rate as the bladder becomes more full. This causes the micturition reflex, and increases urinary urge, and can even cause involuntary urination.
Detailed explanation-2: -The primary function of the detrusor muscle is to contract during urination to push the urine out of the bladder and into the urethra. The detrusor muscle will relax to allow the storage of urine in the urinary bladder.
Detailed explanation-3: -The micturition reflex is a pathway that involves the integration of bladder filling, storage, and emptying of the bladder with urethral sphincter contraction and relaxation (see Figure 51-2).