Final answer:
New plasma membrane reaches the plasma membrane through the vesicle transport pathway from the endoplasmic reticulum to the plasma membrane, and possibly returning to the Golgi apparatus for modification.
Step-by-step explanation:
New plasma membrane reaches the plasma membrane through the vesicle transport pathway. It travels from the endoplasmic reticulum to the plasma membrane, and may also return to the Golgi apparatus to undergo modification. This pathway ensures that the newly synthesized proteins and lipids in the endoplasmic reticulum are transported and inserted into the correct location in the plasma membrane.