Which of the following produces antibodies?

Appeared in: Haryana CHO - 2022

Explanation

B-lymphocytes are the key components of the humoral immune system.
Upon activation by a specific antigen, B-lymphocytes undergo differentiation to become plasma cells.
Plasma cells are highly specialized cells that act as factories, producing and secreting large volumes of antibodies.
These antibodies circulate in the body's fluids to target and neutralize extracellular pathogens and toxins.

Option A: Monocytes are a type of phagocytic white blood cell. Their primary role is to engulf and digest pathogens, cellular debris, and dead cells. They do not produce antibodies.
Option C: Haplocytes is not a recognized term for a type of cell in the human immune system. It is included as a distractor to test for precise knowledge.
Option D: T-lymphocytes are central to cell-mediated immunity. They have various functions, including directly killing infected cells (cytotoxic T-cells) and activating other immune cells (helper T-cells), but they do not produce or secrete antibodies.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Antibody production and functions of immune cells as background academic context rather than a clinical decision trigger.
The principle of vaccination is based on stimulating B-lymphocytes to produce antibodies and memory cells against a specific pathogen, providing long-term immunity without causing the disease.
Disorders of B-cell function, such as X-linked agammaglobulinemia, result in an inability to produce antibodies, leaving patients highly vulnerable to recurrent bacterial infections.
What if a patient's blood work shows a very low B-cell count? This would indicate a compromised humoral immune system, and the nurse should anticipate implementing infection control precautions and preparing for potential immunoglobulin replacement therapy.

How to Approach the Question

First, identify the key function asked in the question, which is 'produces antibodies'.
Recall the two main arms of the adaptive immune system: humoral and cell-mediated immunity.
Associate humoral immunity with B-lymphocytes and the production of antibodies.
Associate cell-mediated immunity with T-lymphocytes, which do not produce antibodies.
Evaluate the other options. Monocytes are known for phagocytosis, not antibody production.
Recognize that 'Haplocytes' is not a standard immunological term and can be eliminated as a distractor.

Concept Tested & Keywords

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E6 Harper's Illustrated Biochemistry2023 (pp 26-793 of 813) p. 654-656

E6 Biochemistry U Satyanarayana— Part 2 (pp 421-820 of 840) p. 346-348

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Practise the full Haryana CHO - 2022

Attempt every question from this paper in a timed mock, then review the full solution for each one.