Answer
A
Work Step by Step
Diapedesis is a process by which neutrophils flatten and squeeze through capillary walls in response to inflammatory signals. So the answer is A.
Margination is a process where the leucocytes adhere to the walls of the inflamed blood vessels.
Chemotaxis is the movement of white blood cells from the blood vessels to the injury site. It is mediated by inflammatory chemicals called chemotactic agents.
Opsonization is a process in which a substance called opsonin (example antibody) coats the pathogen surface to facilitate phagocytosis.
