The Immune System: White Blood Cells, Antibodies, and Antigens

Neutrophils are the most abundant type of white blood cell and are responsible for phagocytosis, the process of engulfing and destroying foreign particles.

Lymphocytes are responsible for producing antibodies, which are proteins that bind to and neutralize foreign substances.

Antibodies bind to and neutralize foreign substances, such as bacteria, viruses, and toxins, by preventing them from infecting cells or causing disease.

An antigen is a foreign substance, such as a bacterium, virus, or toxin, that triggers an immune response.

Cell-mediated immunity is responsible for destroying infected cells by releasing cytotoxic substances that kill the infected cells.

Humoral immunity is responsible for producing antibodies, which bind to and neutralize foreign substances.

Innate immunity is non-specific and provides immediate protection against a wide range of pathogens, while adaptive immunity is specific and takes time to develop but provides long-lasting protection.

Platelets are not a type of white blood cell. They are involved in blood clotting.

IgD is not a type of antibody. It is a type of immunoglobulin that is found on the surface of B cells.

Self-antigens are not antigens. They are molecules that are recognized by the immune system as belonging to the body.

Regulating the body's temperature is not a function of the immune system.

Cancer is not a type of immune disorder. It is a disease in which cells grow out of control.

Toxoid vaccine is not a type of vaccine. It is a type of immunogen that is used to produce antibodies against a toxin.

Radiation therapy is not a type of immunotherapy. It is a type of cancer treatment that uses high-energy radiation to kill cancer cells.

Antiprotozoal is not a type of antimicrobial agent. It is a type of drug that is used to treat infections caused by protozoa.