Question

Which one secrets antibodies?
A. Neutrophil
B. Eosinophil
C. Lymphocytes
D. Monocyte

Answer 1

Hint: A specialized, Y-shaped protein that binds like a lock-and-key to the body's foreign invaders such as bacteria, fungi viruses, or parasites is called antibodies. The antibody is also called immunoglobulin. Plasma cells produce antibodies that are used by the immune system to neutralize pathogens.

Complete answer: Antibodies are specialized cells that play an important role in the immune system of the body. The B cells of the adaptive immune system produce antibodies. Specialized white blood cells called lymphocytes or B lymphocytes secrete antibodies. The lymphocytes are stimulated by the antigen that binds to the surface of the antibody which causes the lymphocytes to divide into identical groups of cells called a clone. Millions of antibodies are secreted by the lymphocytes into the bloodstream and also in the lymphatic system. A neutrophil is a type of granulocyte of white blood cells which constitutes 40% to 70% of total white blood cells. Neutrophils regulate the function of phagocytosis by engulfing microorganisms or particles. Therefore, neutrophils are phagocytes. Eosinophils are also called acidophils. Eosinophils are responsible for the secretion of growth factors and also play a vital role in fighting viral infections. Monocyte is the largest type of leukocyte which can differentiate into macrophages. Monocytes perform 3 main functions such as cytokine production, antigen presentation, and phagocytosis.
So, option C is the correct answer.

Note: Natural killer cells, T cells, and B cells are all included in lymphocytes. Natural killer cells and T cells function in cell-mediated and cytotoxic innate immunity. B cells are responsible for regulating the function of humoral immunity. Antibodies are specific to each and every pathogen that enters the body.