The cell can excrete materials eithe as waste or as useful secretions like hormones into the intercellular fluid. This process, called exocytosis, can proceed by enclosing the material within a vesicle which then moves to the cell membrane and fuses with it. The vesicle then opens to the intercellular fluid and allows the material to diffuse out.
Hickman, et al.
Audesirk & Audesirk