Which cells produce antibodies?

UP CHO - 2018

Microbiology

Easy

Appeared in: UP CHO - 2018

Explanation

Plasma cells are the primary cells responsible for producing and secreting large quantities of antibodies, which are also known as immunoglobulins.
They are terminally differentiated B lymphocytes, meaning a B cell transforms into a plasma cell after being activated by a specific antigen.
These cells function as highly efficient 'antibody factories,' capable of secreting thousands of antibody molecules per second to neutralize pathogens and fight off infections.

Option A: This is a broad category of white blood cells. While B lymphocytes are the precursors to plasma cells, this option is less precise because it also includes T lymphocytes, which do not produce antibodies.
Option B: These are red blood cells. Their primary function is to transport oxygen and carbon dioxide. They have no role in the immune response or antibody production.
Option D: These are a type of white blood cell primarily involved in combating multicellular parasites and participating in allergic reactions. They do not produce antibodies.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Cellular basis of humoral immunity and antibody production as background academic context rather than a clinical decision trigger.
Understanding that plasma cells produce antibodies is fundamental to immunology, particularly in the context of vaccination, which aims to generate these cells and memory cells for long-term protection.
In clinical diagnostics, measuring specific antibody levels produced by plasma cells helps in identifying past or current infections (e.g., COVID-19, HIV).
What if? - If a person has a disorder like Multiple Myeloma, it involves the uncontrolled proliferation of malignant plasma cells. This leads to an overproduction of a single, non-functional antibody (monoclonal protein), which can cause kidney damage, bone lesions, and impaired immunity.

How to Approach the Question

First, identify the key terms in the question: 'produce antibodies'. This points to the humoral immune system.
Recall the different types of blood cells and their primary functions.
Evaluate the options for their role in immunity. Erythrocytes are for oxygen transport, and eosinophils are for parasites/allergies, so they can be eliminated.
Differentiate between 'Lymphocyte' and 'Plasma cells'. A lymphocyte is a broad category. B lymphocytes are the cells that can become antibody producers.
Recognize that B lymphocytes differentiate into a more specialized cell type specifically for mass-producing antibodies. This specialized cell is the plasma cell.
Conclude that 'Plasma cells' is the most precise and correct answer as they are the 'factories' for antibody production.

Concept Tested & Keywords

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E6 Pathology- ROBBINS & COTRAN PATHOLOGIC BASIS OF DISEASE 10TH Ed p. 202-204

E6 Pathology-Textbook of PATHOLOGYHarsh Mohan Part 1 (1-214) p. 105-107