Final answer:
Phagocytosis is the type of transport that involves the engulfing of pathogens by cells of the immune system.
Step-by-step explanation:
The type of transport that involves the engulfing of pathogens by cells of the immune system is phagocytosis. Phagocytosis is a form of endocytosis, which is a type of active transport where the cell membrane surrounds the particle and brings it into the cell. This process is used by immune cells, such as neutrophils, to remove invaders like bacteria.