Defensa inmune (segunda parte)

The video explains how the immune system defends against diseases. Pathogens have unique molecules called antigens. Lymphocytes with matching receptors bind to these antigens, triggering antibody production. Antibodies mark pathogens for destruction. Some lymphocytes remain active after an infection, providing immunity by responding quickly to future attacks. This process underlies how vaccines work, preparing the immune system for faster, more precise responses to known pathogens.

What is the primary function of lymphocytes in the immune system?

• To produce hormones

• To transport oxygen

• To digest food

• To bind to antigens and produce antibodies

How do antibodies assist in eliminating pathogens?

• By breaking down nutrients

• By creating new cells

• By producing energy

• By marking pathogens for destruction

What happens to some lymphocytes after an infection has ended?

• They transform into red blood cells

• They remain active for future responses

• They disappear completely

• They become inactive permanently

Why is the body's immune response faster after the first exposure to a pathogen?

• Because the body becomes weaker

• Because the body has learned to respond more efficiently

• Because the body produces more red blood cells

• Because the pathogen becomes less harmful

What is the principle behind how vaccines work?

• They provide immediate energy

• They introduce a harmless form of the pathogen to build immunity

• They increase the body's temperature

• They decrease the body's immune response