AAMC 7 #115

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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
 
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.
 
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.
 
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