Answer:
the membrane
Step-by-step explanation:
Secretory vesicles are tiny little packages in which certain cell secretions can be transported. The vesicles are membrane bound and produced by the golgi apparatus or endoplasmic reticulum. Most vesicles will have specialized functions and specific materials which they transport. In addition to transportation, secretory vesicles can store or digest certain secreted molecules. Synaptic vesicles store neurotransmitters, hormones are stored in secretory vesicles for release into the blood stream, and enzymes are also stored in secretory vesicles to be used when needed to make cell walls in certain plants, fungi, and bacteria. The release of the substances inside of the secretory vesicle can be stimulated by a neural or hormonal signal. The membrane of the vesicle can then fuse with the membrane of the target cell and essentially spill its contents. The vesicle then adds its membrane to that of the target cell. This is typically temporary until another vesicle is created when certain components are then removed from the cell.