AAMC 7 #115

[destroythemcat]

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It was hypothesized that the decrease in blood flow to the skin resulted from a change in activity of the sympathetic nerves to the skin. which observation would support the hypothesis?

a change in norepinephrine content of blood draining from the skin

 

[destroythemcat]

sorry i didn't finish this post:

Q:It was hypothesized that the decrease in blood flow to the skin resulted from a change in activity of the sympathetic nerves to the skin. which observation would support the hypothesis?

A: a change in norepinephrine content of blood draining from the skin

-->From what I understood, Neurotransmitters are not found in the blood?? So how can this answer be true.

 

[The Brown Knight]

norepinephrine/epinephrine can be released as a neurotransmitter by sympathetic motor neurons. however, the adrenal medulla can also release these as hormones into the bloodstream via excitation by the sympathetic nerves.
I guess the release into the bloodstream provides a longer-lasting effect.

 

[Shirafune]

In the future, please refrain from posting threads for specific AAMC practice test questions. It might be a spoiler for those that have yet to take them. You can find the AAMC 7 thread here:
http://forums.studentdoctor.net/threads/aamc-cbt7-and-7r-official-q-a.516255/

The rest of the threads can be found here:
http://forums.studentdoctor.net/thr...ussing-aamc-questions-will-be-closed.1015927/

I'm sure if you dig around the AAMC 7 thread you can find a suitable answer.