Question

Antibodies are produced by?
(a) Histiocytes
(b) Mast cells
(c) Plasma cells
(d) Fibroblasts

Answer 1

The cells in humoral mediated immunity that gets matured in the Thymus proliferate into these cells and these cells release antibodies against the antigen.

Complete step by step answer:
There are two types of immunity in the body i.e, cell-mediated immunity and antibody-mediated immunity. When a foreign particle enters into the body our immune system gets activated to eliminate the foreign particle. The two important cells present in the immune system are T cells and B cells. T cells and B cells take part in cell-mediated immunity and antibody-mediated immunity respectively. T cells proliferate into T Helper cells and T cytotoxic cells where B cells proliferate into plasma cells. These plasma cells are the effector cells of B cell clones that secrete specific antibodies.
So, the correct answer is ‘(c) plasma cells’

Additional information: Histiocytes are less phagocytic forms of macrophages, a type of white blood cells produced by bone marrow which helps in the removal of dead and dying tissue and destruction and ingestion of invading organisms.
Mast cells are a type of WBC found in connective tissues throughout the body which contain chemicals such as histamine, heparin, cytokines released during allergic reactions, and certain immune responses that affect the widening of blood vessels and angiogenesis.
Fibroblasts are the main connective tissue cells present in the body which are responsible for making the extracellular matrix and collagen which play an important role in cell repair.

Note: Antibody-mediated immunity is also called humoral mediated immunity.
B cells are found in the bursa of Fabricius in birds initially, so they named these cells as B cells.
T cells become matured in the thymus so they named these cells as T cells.