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Receptor proteins are important in the functioning of both the nervous and hormone-secreting systems because they are

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Answer:

Receptors are a special class of proteins that function by binding a specific ligand molecule. When a ligand binds to its receptor, the receptor can change conformation, transmitting a signal into the cell. In some cases the receptors will remain on the surface of the cell and the ligand will eventually diffuse away.

Step-by-step explanation:

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