immune System

Anything that triggers an immune response.

By protecting other organs and tissues from infection and disease.

An allergy.

It first recognizes a foreign body, eats it, and displays it to other cells.

Antigens.

Innate immunity and adaptive immunity.

They help regulate the immune response and directly attack infected cells.

They produce antibodies that target specific antigens.

Active immunity is developed through exposure to antigens, while passive immunity is acquired through antibodies from another source.

To identify and neutralize pathogens such as bacteria and viruses.