Foreign substances would suffice as well as contaminants, toxins, etc.
antibodies
Antigens Antibodies neutralize these molecules.
antigens
Substances foreign to the body are typically called antigens. These can include viruses, bacteria, toxins, and other microorganisms that are not naturally present in the body. When the immune system detects these foreign substances, it mounts a response to eliminate them and protect the body from potential harm.
Antigens is the term for molecules that are foreign to the body.
To rid your body of foreign substances in your nose,
Immune system
'Foreign' chemicals which get into the blood and provoke an immune response are called antigens.
Proteins that destroy foreign substances are called antibodies. Antibodies are produced by the immune system in response to the presence of antigens, such as bacteria and viruses, to help eliminate these foreign invaders from the body.
These specialized cells are called immune cells, particularly T cells and B cells. They play a crucial role in the body's immune response by identifying and responding to foreign antigens to eliminate them and protect the body from infections.
These substances are called nutrients.
The body's defense system is the immune system.