Question

Humoral immunity system is mediated by
a) B-cells
b) T-cells
c) NK cells
d) Plasma cells

Answer 1

Humoral immunity, also known as humoural immunity, is a form of immunity mediated by extracellular macromolecules such as secreted antibodies, complement proteins, and antimicrobial peptides.

Complete answer:
Within the adaptive immune system, there are two primary mechanisms of immunity: humoral and cellular immunity.
Antibody-mediated immunity is another name for humoral immunity. B cells can divide into plasma B cells, which can develop antibodies against a particular antigen, with the aid of helper T cells.Antigens from bacteria that are freely circulating or outside infected cells are dealt with by the humoral immune system. B cells contain antibodies that bind to antigens, neutralising them or causing lysis (cell breakdown or death by a lysin) or phagocytosis.
T lymphocytes mediate cellular immunity, which occurs within infected cells. Antigens of the pathogen are expressed on the cell surface or on antigen-presenting cells. Helper T cells secrete cytokines that aid activated T cells in binding to the MHC-antigen complex on infected cells and transforming the T cell into a cytotoxic T cell. After that, the contaminated cell is lysed.
The humoral immune response (HIR) is a form of immunity mediated by B cells' secreted antibodies. Antibodies secreted by the body bind to antigens on the surfaces of invading pathogens, signalling them to be destroyed. Humoral immunity gets its name from the fact that it contains humours, or bodily fluids. Active and passive humoral immunity are the two forms of humoral immunity.
Active humoral immunity is any type of immunity that develops as a result of the body's own immune system forming an adaptive immune response. The transfer of active humoral immunity in the form of ready-made antibodies from one individual to another is known as passive immunity.

The correct Answer is option (A) B-cells.

Note:
Humans with humoral immune system defects are often diagnosed early in life, when the amount of antibodies passed down from their mothers (passive immunity) decreases. The humoral immune system's failure may have a variety of causes due to its complexity.