The primary storage forms of iron in the human body are ______.

Appeared in: BTSC 3 August 2025

Explanation

The body stores iron primarily in two forms: ferritin and hemosiderin.
Ferritin is the main, water-soluble iron-storage protein, found predominantly in the liver, spleen, and bone marrow. It allows for the rapid mobilization of iron when needed.
Hemosiderin is an insoluble, iron-storage complex derived from ferritin aggregates. It is found in macrophages and represents a more long-term, less accessible iron reserve, which increases in states of iron overload.

Option A: Endorphins are neuropeptides involved in pain relief, and melanin is a pigment responsible for coloration. Neither is involved in iron storage.
Option B: Melatonin is a hormone that regulates the sleep-wake cycle, and enkephalins (encephalins) are peptides that modulate pain perception. They have no role in iron metabolism.
Option C: Serotonin is a key neurotransmitter regulating mood and other functions, while prolactin is a hormone essential for lactation. Neither stores iron.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Iron storage mechanisms in the human body as background academic context rather than a clinical decision trigger.
Nurses assess serum ferritin levels to evaluate a patient's iron stores, which is crucial for diagnosing iron deficiency anemia (low ferritin) or iron overload conditions like hemochromatosis (high ferritin).
Understanding iron storage is vital for patient education, especially for those on iron supplements, to explain the importance of adherence and the risks of iron toxicity.
In patients receiving multiple blood transfusions, nurses monitor for signs of iron overload (hemosiderosis), as the breakdown of transfused red blood cells releases large amounts of iron that get stored as hemosiderin, potentially causing organ damage.

How to Approach the Question

First, identify the core concept of the question, which is 'storage forms of iron'.
Scan the options to categorize the substances listed. You should recognize that options A, B, and C contain hormones, neurotransmitters, or pigments.
Recall from physiology that these substances (e.g., serotonin, melatonin, melanin) have specific functions unrelated to mineral storage.
This process of elimination leaves only one plausible option related to iron metabolism.
Confirm by recalling that 'ferritin' is the primary iron-storage protein. The term 'hemosiderin' is also associated with iron, specifically in overload states, confirming this pair as the correct answer.

Concept Tested & Keywords

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E6 PATHOLOGY QUICK REVIEWBased on Harsh Mohan Textbook of PATHOLOGY pp. 17-19, 100-102

E6 Pathology- ROBBINS & COTRAN PATHOLOGIC BASIS OF DISEASE 10TH Ed p. 657-659

Practise the full BTSC 3 August 2025

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