(39) GCSE Biology Revision "The Immune System"

Immune System

A system in the body that protects against pathogens by destroying them and their toxins.

Pathogen

An organism that causes disease, such as bacteria or viruses.

Nonspecific defense system

The part of the immune system that prevents pathogens from entering the body.

Phagocytosis

The process by which white blood cells ingest and destroy pathogens.

White blood cells

Cells of the immune system that play a key role in protecting the body from infection.

Antibodies

Protein molecules produced by white blood cells that specifically target and neutralize pathogens.

Antitoxins

Chemicals produced by white blood cells that neutralize toxins released by pathogens.

Ingest

To take in (as in the case of white blood cells taking in pathogens).

Specific immunity

The immune response that develops antibodies against specific pathogens to protect against future infections.

Toxins

Chemicals released by bacteria that can make us feel unwell.