Aprimary active transport process is one in which hints a primary active transport process is one in which molecules move through transport proteins that have been activated by atp an intracellular vesicle fuses with the plasma membrane and releases its contents to the extracellular fluid molecules pass directly through the phospholipid bilayer of the plasma membrane molecules move across the plasma membrane without an input of energy the plasma membrane folds inward to form a vesicle containing extracellular material