ANATOMY

Detailed explanation-1: -The immune system recognizes and destroys, or tries to destroy, substances that contain antigens. Your body’s cells have proteins that are antigens.

Detailed explanation-2: -The immune system is a complex network of organs, cells and proteins that defends the body against infection, whilst protecting the body’s own cells. The immune system keeps a record of every germ (microbe) it has ever defeated so it can recognise and destroy the microbe quickly if it enters the body again.

Detailed explanation-3: -When the body senses foreign substances (called antigens), the immune system works to recognize the antigens and get rid of them. B lymphocytes are triggered to make antibodies (also called immunoglobulins). These proteins lock onto specific antigens.

Detailed explanation-4: -White blood cells: Serving as an army against harmful bacteria and viruses, white blood cells search for, attack and destroy germs to keep you healthy. White blood cells are a key part of your immune system.

Detailed explanation-5: -AIDS. HIV, which causes AIDS, is an acquired viral infection that destroys important white blood cells and weakens the immune system.