Cell Signalling and Transduction
Why is it that inhaling nitric oxide reduces blood pressure only in the lung tissue and not elsewhere in the body*?

Because nitric oxide breaks down quickly and thus cannot travel far
Because nitric oxide cannot cross cell membranes and enter the blood
None of these
Because other body tissues use a different signaling molecule

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Cell Signalling and Transduction
Cell signaling can be classified into

three distinct types based on the signaling molecules
three distinct types based on the distance over which the signaling molecules act
None of these
two distinct types based on the distance over which the signaling molecules act

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Cell Signalling and Transduction
Two key organizing principles for large multicellular organisms are

simple nerve reflexes and cell specialization
prokaryotic cell structure and cell specialization
cell specialization and communication between cells
communication between cells and simple nerve reflexes

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