What cellular process directly involves molecules exiting the cell?

Exocytosis is the cellular process involved in the transport of molecules out of a cell. During this process, vesicles containing substances fuse with the plasma membrane, allowing their contents to be released into the extracellular space. This mechanism is crucial for various cellular functions, such as the secretion of hormones, neurotransmitters, and waste products.

The process is highly regulated and can be triggered by specific signals, ensuring that the right molecules are transported out of the cell at the right time. Overall, exocytosis plays a vital role in maintaining cellular homeostasis and facilitating communication between cells.