Cellular communication refers to the process by which cells send and receive signals to coordinate their activities. This communication is essential for maintaining homeostasis and responding to changes in the environment. Cells use various signaling molecules, such as hormones and neurotransmitters, to transmit information. These signals bind to specific receptors on target cells, triggering a response that can affect growth, metabolism, or immune responses. In multicellular organisms, cellular communication allows for complex interactions between different cell types. For example, in the human body, neurons communicate with muscle cells to facilitate movement, while immune cells coordinate responses to infections. This intricate network of signaling ensures that cells work together effectively to support overall health and function.