NEET BIOLOGY

Detailed explanation-1: -When antibodies attach to an antigen (think a lock–key configuration), it signals other parts of the immune system to attack and destroy the invaders. This is how the human body develops immunity (acquired) to a particular disease.

Detailed explanation-2: -Immunity to a disease is achieved through the presence of antibodies to that disease in a person’s system. Antibodies are proteins produced by the body to neutralize or destroy toxins or disease-carrying organisms.

Detailed explanation-3: -Another critical component of vaccination is that it helps produce memory B-and T-cells that are specific to the virus. Like an army reserve force, these immune cells can be quickly activated in the future to produce antibodies to stop the virus from invading your body. And unlike antibodies, these cells persist.

Detailed explanation-4: -Active Immunity-antibodies that develop in a person’s own immune system after the body is exposed to an antigen through a disease or when you get an immunization (i.e. a flu shot). This type of immunity lasts for a long time.