Why do fluorescence spectrometers often use double-beam optics?

Question: Why is it that inhaling nitric oxide reduces blood pressure only in the lung tissue and not elsewhere in the body*?
[A].

Because other body tissues use a different signaling molecule

[B].

Because nitric oxide cannot cross cell membranes and enter the blood

[C].

Because nitric oxide breaks down quickly and thus cannot travel far

[D].

None of the above

Answer: Option C

Explanation:

No answer description available for this question.