| A | B |
|---|
| A virus or organism that causes an infectious disease | Pathogen |
| The first and second line of defense against pathogens and foreign substances | Nonspecific Defenses |
| Defenses to specific pathogens | Specific Defenses |
| Leucocytes that engluf and digest unwanted cells and pathogens in a nonspecific manner | Phagocytes |
| The largest phagocyte | Macrophages |
| leukocytes involved in the body's specific defense system | Lymphocytes |
| A nonspecific defense reaction to tissue damage caused by injury or infection | Inflammatory Response |
| Injured cells release this chemical which triggers the inflammatory response | Histamine |
| A molecule that elicits the immune response | Antigen |
| Immunity against pathogens in the fluid of the body is called | Humoral Immunity |
| A disease-fighting protein produced in response to a specific antigen | Antibody |
| Antibodies are produced by white blood cells called | B Lymphocytes |
| Special lymphocytes directly attack cells that are harmful to the body | Cell-mediated Immunity |
| White blood cells that recognize and destroy cells dangerous to the body | T Lymphocytes |
| When the immune system reacts to a harmless substance as if it were an antigen, producing antibodies | Allergy |
| When the immune system mistakes its own cells for pathogens and attacks the tissues of the bodyq | Autoimmune Disease |
| A virus that attacks the human immune system, destroying the body's ability to fight infection | HIV |
| A preparation containing dead or weakened pathogens that is designed to increase the body's immunity | Vaccine |
