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AAMC Bio Question 46

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nostra_damus

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If acetylcholine is removed from the circulation faster than norepinephrine is, which of the following autonomic processes would be most rapidly inactivated?

Can somebody please explain why the answer is not A? I get that the passage says acetylcholine is related to both PNS and SNS systems, but the question stem suggests that there is more norepinephrine in the system, which the passage says is related to the radial muscles in the eye which causes dilation of the pupils. This seems like a direct contradiction to me... Thanks!!
 

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Nugester

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So, if you remove acetylcholine and all that's left is norepinephrine, SNS is working, so A, B, C would be working. No PS would mean D would be inactivated.
 
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