How does your immune system work as the second line of defense?

White blood cells create phagocytes that engulf pathogens. This is called phagocytosis. B-lymphocytes produce memory cells, they also make antibodies that have a complementary shape to antigens. They bind onto them so they can be found and destroyed. T-lymphocytes kill infected or cancerous cells and can co-ordinate B-lymphocytes. Lymphocytes also produce antitoxins that neutralize toxins produced by bacteria.