Receptor activation

Receptor activation occurs when a specific chemical, such as a hormone or drug, binds to a receptor—like a lock and key—located on the surface or inside a cell. This binding triggers a response within the cell, such as opening a channel, sending a signal, or changing activity. Think of the receptor as a sensor that detects signals and relays information, helping the cell respond appropriately to its environment. This process is essential for many bodily functions, including communication between cells, immune responses, and regulation of different physiological processes.