Theories of cell signaling

Cell signaling theories describe how cells communicate and coordinate actions. They involve signals, like hormones or proteins, which travel to target cells and bind to specific receptors. This binding triggers a series of internal events—such as activating enzymes or changing gene expression—that lead to a response. Key theories include the "lock and key" model, where signals fit specific receptors, and "signal transduction," which explains how signals are converted into actions inside the cell. Overall, these theories help us understand how cells sense their environment and work together to maintain health or respond to changes.