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13.3. Immunity and immune system

Immunity and immune system

A person is immune to a certain infectious disease when he is invulnerable to that disease. Formerly it was already known that people who had suffered and overcome an infection, became immune to that disease and did not have that disease again.

The immune system is made up of the set of cells and molecules that are involved in the immunization of the body. The main characteristic of the immune system is the ability to recognize  antigens (foreign molecules to the body) and eliminate them.

Questions that have come out in University entrance exams (Selectividad, EBAU, EvAU)

Aragon. September 2014, option B, question.

Define the following terms referring to immunity: (2 points)

Immune system. (0.5 points)