The Immune System The Immune System P A R T A 1 Immunity: Two Intrinsic Defense Systems Innate (nonspecific) system responds quickly and consists of: First line of defense…

21 Immune System: Functions Protects against pathogens Bacteria Viruses Parasites Protects against foreign molecules (e.g., toxins) Removes dead or damaged cells Attempts…

The Immune System The Immune System P A R T A 1 Immunity: Two Intrinsic Defense Systems Innate (nonspecific) system responds quickly and consists of: First line of defense…

Mechanism of Phagocytosis Figure 21.1a, b Natural Killer (NK) Cells Cells that can lyse and kill cancer cells and virus-infected cells Natural killer cells: Are a small,…

21 Immune System: Overview The immune system has three types of components Lymphoid tissues Various types of immune cells Chemical signals that coordinate responses Copyright…

21 Immune System: Overview The immune system has three types of components Lymphoid tissues Various types of immune cells Chemical signals that coordinate responses Copyright…