MP NHM CHO-2024 (Shift-2)
Applied Physiology
Easy
Where are lymphocytes formed?
Appeared in: MP NHM CHO-2024 (Shift-2)
Explanation
- Bone marrow is the primary site for hematopoiesis, the process of creating new blood cells in adults.
- All blood cells, including lymphocytes (a type of white blood cell), originate from pluripotent hematopoietic stem cells found within the red bone marrow.
- While some lymphocytes mature in other organs (like the thymus), their initial formation from stem cells occurs in the bone marrow.
Why Other Options Were Wrong
- Option A: The cranium is the collection of bones forming the skull. While its flat bones contain bone marrow, the cranium itself is a protective bony structure, not the tissue responsible for cell formation.
- Option C: Trabeculae are the small, beam-like structures that make up the lattice of spongy bone. Red bone marrow fills the spaces between trabeculae, but the trabeculae are part of the bone's architecture, not the cell-producing tissue.
- Option D: The spinal cord is a critical part of the central nervous system, responsible for transmitting nerve signals. It has no function in the production of blood cells.
Related Visual
- Visual 1: Diagram: Illustrating hematopoiesis, showing a hematopoietic stem cell in the bone marrow differentiating into various blood cell lines, including the lymphoid progenitor cell leading to lymphocytes.
- Visual 2: Anatomical Illustration: A cross-section of a long bone, clearly labeling the outer compact bone, the inner spongy bone with trabeculae, and the red bone marrow where blood cells are formed.
Clinical Relevance
- Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Hematopoiesis and Lymphocyte Origin as background academic context rather than a clinical decision trigger.
- Understanding that lymphocytes originate in the bone marrow is crucial for diagnosing and managing diseases like leukemia (cancer of blood-forming tissues), lymphoma (cancer of the lymphatic system), and aplastic anemia (bone marrow failure).
- What if? If a patient undergoes chemotherapy that suppresses bone marrow function, the nurse would anticipate a drop in all blood cell counts (pancytopenia), including lymphopenia (low lymphocytes), leading to a severely compromised immune system and a high risk of infection. Monitoring for signs of infection becomes a top priority.
How to Approach the Question
- First, identify the key term in the question: 'lymphocytes'.
- Recall that lymphocytes are a type of white blood cell.
- Access your knowledge of hematology and physiology to remember the origin of all blood cells. The process is called hematopoiesis.
- Remember that the primary site for hematopoiesis in adults is the red bone marrow.
- Evaluate the options: 'Cranium' and 'Trabeculae' are related to bone structure but are not the cell-producing tissue itself. 'Spinal cord' is nervous tissue. 'Bone marrow' is the correct tissue.
Concept Tested & Keywords
- Concept Tested: Hematopoiesis and Lymphocyte Origin
- Stem keywords: lymphocytes, formed
- Lead-in keywords: Where are
- Negative lead-in flag: false
Question ID
QFskud73sdU3Bvbep3yq5L
Reference Book
E6 Guide to Mental Health & PSYCHIATRIC NURSING R Sreevani 6th Edition — Part 2 (pp 290-564 of 579) p. 489-589
Practise the full MP NHM CHO-2024 (Shift-2)
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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