When cells receive signals from other cells, they then need to react to the signal. In this section, we will discuss how cells convert these “messages” into actions. This mechanism is called signal transduction. Signal transduction is a series of molecular events by which a cell receives and responds to chemical or physical signals. There are three main phases – reception, transduction, and cellular response. Signal transduction plays an important role in cell function as it regulates processes, including how a cell should respond to multiple, simultaneous signals. Signal transduction links signal reception with cellular responses.