Question

Humoral immunity system is mediated by __________.

• A. B- cells.
• B. T-cells.
• C. NK- cells.
• D. Plasma cells.

Answer 1

The correct option is A

B- cells.

The correct option is A.

Explanation for the correct option:

1. Humoral immunity, also known as antibody-mediated immunity, is a type of adaptive immunity that safeguards the body against foreign bodies and pathogens.
2. Immunity mediated by antibodies produced and secreted by B cells or B lymphocytes is included in this category.
3. Antibodies against antigens are primarily produced by B lymphocytes.
4. A combination of processes involving B cell antigen recognition, clonal proliferation, and terminal differentiation into plasma cells results in B cell activation and antibody production.

Explanation for the incorrect options:

Option B:

1. T cells are immune cells that develop from stem cells in the bone marrow.
2. They help to protect the body from infection and may aid in the fight against cancer. They are involved in the cell immunity system.

Option C:

Natural killer (NK) cells are innate immune system effector lymphocytes that control tumours and microbial infections by limiting their spread and subsequent tissue damage.

Option D:

Plasma cells are immune-producing cells. Plasma cells are responsible for the synthesis and excretion of immunoglobulins.

Final answer: Humoral immunity system is mediated by B- cells.