Question at position 39 The pontine storage center facilitates the storage of urine by enhancing Printed Blank[input]Question Blank 1 of 1[input] activity to keep the internal urethral sphincter contracted.parasympatheticsympathetic

Question

BlackTom AI · Accepted Answer

Here’s how to approach the question about the pontine storage center and urine storage.

Option context: The prompt asks which autonomic activity the pontine storage center enhances to keep the internal urethral sphincter contracted, thereby promoting urine storage. The two classic autonomic divisions to consider are sympathetic and parasympathetic.

Option: sympathetic (correct answer in the provided data)
- Rationale: During urine storage, the sympathetic nervous system predominates. Activation of the hypogastric nerve releases norepinephrine, which acts on alpha-1 receptors to maintain contraction of the internal (involuntary) urethral sphincter, and on beta-3 receptors to relax the detrusor muscle of the bladder. This combination preserves the bladder neck tone and prevents involuntary leakage, aligning with storage of urine. The pontine storage center coordinates this sympathetic influence to keep the bladder in a relaxed state while keeping the sphincter closed.

Option: parasympathetic (incorrect in this context)
- Rationale: Parasympathetic outflow promotes storage opposite to the goal described. It primarily causes detrusor muscle contraction via muscarinic receptors and facilitates relaxation of the internal sphincter, promoting micturition rather than storage. If the parasympathetic system were dominant, one would expect bladder contraction and sphincter relaxation, not continued storage.

Why the question’s phrasing supports the sympathetic answer: the phrase 'pontine storage center' explicitly points to neural circuits that sustain urine storage rather than initiating voiding. This center modulates sympathetic tone to keep the internal urethral sphincter contracted during storage phases, preventing leakage until the appropriate time for urination.

In summary, the sympathetic pathway maintains storage by promoting internal sphincter contraction and detrusor relaxation, whereas the parasympathetic pathway would drive micturition by opposing sphincter tone and stimulating bladder contraction. The described mechanism aligns with sympathetic activation during urine storage.

Question at position 39 The pontine storage center facilitates the storage of urine by enhancing Printed Blank[input]Question Blank 1 of 1[input] activity to keep the internal urethral sphincter contracted.parasympatheticsympathetic

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