Antigen

The video explains how the immune system responds to antigens by producing specific antibodies. It describes antigens as molecules found on bacteria, viruses, and other microorganisms, as well as non-microbial antigens like pollen that can also trigger immune responses.

What is the primary role of the immune system when it encounters an antigen?

• To ignore the antigen

• To produce specific antibodies

• To decrease body temperature

• To produce red blood cells

Where are antigens typically found?

• Inside the nucleus of cells

• On the surface of bacteria and viruses

• In the bloodstream

• In the digestive system

What is a common feature of antigens?

• They are only found in plants

• They are always harmful

• They are produced by the immune system

• They are molecules on the surface of microorganisms

Which of the following is an example of a non-microbial antigen?

• Bacteria

• Virus

• Pollen

• Fungi

How do non-microbial antigens like pollen affect the body?

• They help in digestion

• They are harmless and ignored by the body

• They can trigger an immune response

• They always cause infections