<P> To reach the site of infection , phagocytes leave the bloodstream and enter the affected tissues . Signals from the infection cause the endothelial cells that line the blood vessels to make a protein called selectin , which neutrophils stick to on passing by . Other signals called vasodilators loosen the junctions connecting endothelial cells , allowing the phagocytes to pass through the wall . Chemotaxis is the process by which phagocytes follow the cytokine `` scent '' to the infected spot . Neutrophils travel across epithelial cell - lined organs to sites of infection , and although this is an important component of fighting infection , the migration itself can result in disease - like symptoms . During an infection , millions of neutrophils are recruited from the blood , but they die after a few days . </P>
<P> To reach the site of infection , phagocytes leave the bloodstream and enter the affected tissues . Signals from the infection cause the endothelial cells that line the blood vessels to make a protein called selectin , which neutrophils stick to on passing by . Other signals called vasodilators loosen the junctions connecting endothelial cells , allowing the phagocytes to pass through the wall . Chemotaxis is the process by which phagocytes follow the cytokine `` scent '' to the infected spot . Neutrophils travel across epithelial cell - lined organs to sites of infection , and although this is an important component of fighting infection , the migration itself can result in disease - like symptoms . During an infection , millions of neutrophils are recruited from the blood , but they die after a few days . </P>
is the process by which phagocytic cells enter the tissues from capillaries
is the process by which phagocytic cells enter the tissues from capillaries
Chemotaxis
Chemotaxis