Answer:
Immune reaction.
Explanation:
Plasma cell disorders are generally uncommon. They begin at that time when a single plasma cell multiplies excessively. This results in a group of genetically identical cells (called a clone), which produces a large quantity of a single type of antibody (immunoglobulin). Plasma cells develop from B cells (B lymphocytes), which is a type of white blood cell that usually produces antibodies. These proteins help the body to fight against infection. This means they help in the immune system.
In plasma cell disorders, one clone of plasma cells repeatedly multiply, which can’t be controlled. As a result, these clone creates a vast amount of a single antibody (monoclonal antibody) which is known as the M-protein. In some cases (such as with monoclonal gammopathies), the antibody produced remains incomplete, consisting of only light chains or heavy chains (fully functional antibodies usually comprised of two pairs of two different chains called a light chain and heavy chain). The abnormal plasma cells and the antibodies which they produce are limited to one type, and levels of other kinds of antibodies that help in the fight against infections start falling.
People with plasma cell disorders are often at higher risk of infections than others. So, from this discussion, we can say that plasma cell disorder affects the immune system.
