Question

At which time interferon is secreted?

• A.
  When antibody reacts with antigen in our body.
• B.
  When serotonin become active
• C.
  When lymphocytes become active
• D.
  When our body cell's are infected by virus then that cell's secrete this chemical.

Answer 1

The correct option is D

When our body cell's are infected by virus then that cell's secrete this chemical.
Interferons are proteins that are part of our natural defenses. They tell our immune system that germs or cancer cells are in our body and they trigger killer immune cells to fight those invaders. Interferons got their name because they "interfere" with viruses and keep them from multiplying.

Type I interferon (IFN-alpha and IFN-beta) is secreted by virus-infected cells while type II, immune or gamma interferon (IFN-gamma) is mainly secreted by T cells, natural killer (NK) cells and macrophages.

Interferon is secreted by cells in response to stimulation by a virus or other foreign substance, but it does not directly inhibit the virus's multiplication. Rather, it stimulates the infected cells and those nearby to produce proteins that prevent the virus from replicating within them.

So the correct answer is "option d".