Final answer:
The membrane of a vesicle fuses with and becomes part of the plasma membrane after exocytosis, maintaining the integrity and continuity of the cell's outer membrane.
Step-by-step explanation:
After exocytosis, the membrane of the vesicle becomes part of the plasma membrane. This process of membrane fusion allows the vesicle to release its contents into the extracellular environment. Following the release, the vesicle's membrane becomes incorporated into the plasma membrane, thereby maintaining the size and integrity of the cell's outer membrane.
In instances of cellular activities such as phagocytosis, the vesicular membrane separates itself from the plasma membrane during the intake of extracellular material but eventually re-merges with the plasma membrane once the contents of the vesicle have been processed and the vesicle is ready to excrete waste or release specific molecules to the cell's exterior.
Vesicles that move from the endoplasmic reticulum or Golgi to the plasma membrane carry substances that are to be released from the cell. Once the vesicles merge with the plasma membrane during exocytosis, their membrane components become part of the plasma membrane. This is an essential aspect of maintaining the overall membrane continuity and homeostasis in the cell.