Cell Signalling and Transduction
Cell signaling can be classified into

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

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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 other body tissues use a different signaling molecule
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

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