Discussion
A cell's response to a given signal depends on
Answer: A
Correct answer: which receptors and relay proteins it possesses
The signal carries no instruction of its own - the response is determined by the machinery of the receiving cell. That is why acetylcholine slows the heart, contracts skeletal muscle and stimulates salivary secretion: three cell types, three sets of receptors and relay proteins, three responses to the same molecule.
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