PATHOLOGY

Detailed explanation-1: -Macrophages respond to foreign bodies due to their ability to recognize self and non-self. Antigen-presenting cells, which include macrophages and dendritic cells, are able to process antigens during their and present them to the cells of the adaptive immune system.

Detailed explanation-2: -Macrophages are a type of white blood cell that play an integral part in the immune system with the role of phagocytosing foreign antigens, such as bacteria. They are able to present these antigens to other immune cells, such as T-cells, for further destruction.

Detailed explanation-3: -White blood cells are the key players in your immune system. They are made in your bone marrow and are part of the lymphatic system. White blood cells move through blood and tissue throughout your body, looking for foreign invaders (microbes) such as bacteria, viruses, parasites and fungi.

Detailed explanation-4: -In the 1880s Russian-born zoologist and microbiologist Élie Metchnikoff introduced the term phagocyte in reference to immune cells that engulf and destroy foreign bodies such as bacteria.