1. The adaptive response develops over time as the body encounters various pathogens
. This is the type of response that most people think of when they think of an immune response.
2. It has the ability to remember previous attacks and quickly generate defenses against them
- 3. Components:
- ......a. An antigen is any substance the body regards as foreign
- ......b. Lymphocytes are a specical type of WBC, that are a major part of the adaptive response. Lymphocytes are originally formed in the red bone marrow as stem cells.
These immature immature lymphocytes start circulating through the body where they undergo differentiation (meaning the stem cells will mature into different types of cells with different characteristics.)
- They differentiate into 2 different types of cells:
- ............(1.) The first type is a B cell which is a type of lymphocyte that has the abiity to recognize a specific antigen. When it is activated by the presence of this antigen it becomes a plasma B cell which will secrete an antibody against the antigen.
An antibody (also known as immunoglobulin) is a disease-fighting protein that is coded to destroy a particular antigen.
In addition to the plasma B cells that activate, make the antibodies and kill off off all these invaders, B cells can also become memory B cells that have the ability to remember an antigen that has been fought before and 'notify' the body that a former invader is back. This allows the plasma B cells to respond very quickly.
......2. The second type of lymphocyte is the T cell. The T cell is another type of lymphocyte that has been exposed to thyosin, which is secreted in the thymus.
T cells can coordinate immune defenses and kill infected cells ON CONTACT.
T cells do a variety of things, particularly as far as creating chemical proteins that will help fight off an infection.
Example: T cells secrete interferon, a protein produced by T cells to fight viruser.
T cells also produce lymphokines - cells that direct other cells in the imune ystem and tell them wht to do.