OVERVIEW OF THE IMMUNE SYSTEM
ONTOGENY AND PHYSIOLOGY OF IMMUNE SYSTEM
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
antibodies.
|
|
antigens
|
|
natural killer cells.
|
|
immunoglobulins.
|
Detailed explanation-1: -B cells secrete antibodies to antigens in blood and other body fluids, but T cells cannot bind to free-floating antigens. Instead they bind to fragments of foreign proteins that are displayed on the surface of body cells.
Detailed explanation-2: -During T cell-dependent activation, B cells absorb the antigen and then present pieces of the antigen on their surface via a major histocompatibility complex (MHC). Helper T cells can then recognize those antigens via the MHC and activate the B cells.
Detailed explanation-3: -T-cell receptors bind to certain antigens (proteins) found on abnormal cells, cancer cells, cells from other organisms, and cells infected with a virus or another microorganism. This interaction causes the T cells to attack these cells and helps the body fight infection, cancer, or other diseases. Also called TCR.