Which of the following statements is true of any communication system?

A communication system is defined by its ability to convey information from one entity to another through specific signals. The statement regarding the necessity for a signal to be both sent and received captures the essence of communication systems. This principle is fundamental; without the transfer and acknowledgment of signals, effective communication cannot occur.

In biological contexts, this applies across various systems, whether they are neural, endocrine, or others. A signal must be generated by a sender (such as a neuron or a hormone) and received by a target (like another neuron, a muscle cell, or an organ), ensuring that information is transmitted successfully.

The significance of this statement lies in its broad applicability to diverse forms of communication within living organisms, whether they utilize chemical signals, electrical impulses, or other means. Communication in physiological processes relies on the existence of this fundamental exchange of signals, thus affirming the correctness of the chosen statement.