Final answer:
Diapedesis is the step involving the movement of neutrophils between endothelial cells guided by CXCL-8. It's essential for allowing immune cells to reach infected tissues, where they can act as phagocytes to combat pathogens. The correct option is b.
Step-by-step explanation:
The step of neutrophil homing which involves the tight and narrow guiding of neutrophils in between the endothelial cells via the chemokine CXCL-8 is known as diapedesis. This process allows neutrophils to squeeze through the capillary walls to reach and infiltrate infected tissue.
Following chemotaxis, neutrophils respond to chemokines such as CXCL-8 and navigate towards the site of tissue injury or infection, an essential step in the immune response.
Diapedesis, also called extravasation, is a critical part of the immune system's mechanism to combat pathogens. Extravasation of white blood cells, from the bloodstream into infected tissue, occurs through the process of transendothelial migration.
Once in the infected tissue, neutrophils act as phagocytes to engulf and destroy pathogens, a process important in clearing infections. The correct option is b.