Cell Signalling and Transduction - Medical Science

Q1:

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

ANS:C - Because nitric oxide breaks down quickly and thus cannot travel far

Because NO has tendency to get converted into nitrates and nitrites rapidly.