What is the purpose of Biochemical signals?

I am a student of Biomedical Engineering. Yesterday Our teacher gave a quiz on the purposes of biochemical signal I was confused to answer anyone know?
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Signal transduction occurs when an extracellular signaling molecule activates a cell surface receptor. In turn, this receptor alters intracellular molecules creating a response.
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"Biochemical are used for a variety of purposes such as determining levels of glucose, lactate, and metabolites and providing information about the functions of various physiological systems. Source:"
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