Excessive hemolysis may result in the accumulation of which substance in the body?

NVS Staff Nurse - 2019

Biochemistry & Nutrition

Medium

Appeared in: NVS Staff Nurse - 2019

Explanation

Excessive hemolysis means a high rate of red blood cell (RBC) destruction, releasing large amounts of hemoglobin.
The heme portion of hemoglobin is catabolized into biliverdin, which is then reduced to bilirubin.
This rapid production of bilirubin overwhelms the liver's capacity to conjugate and excrete it.
As a result, unconjugated bilirubin accumulates in the blood, leading to hyperbilirubinemia and clinical jaundice.

Option A: Globulin is a type of protein. The 'globin' part of hemoglobin is broken down into amino acids for recycling, not accumulated as globulin. In fact, haptoglobin, a type of globulin that binds free hemoglobin, becomes depleted during hemolysis.
Option B: Haem (heme) is an intermediate product in the breakdown of hemoglobin. It is a highly reactive molecule that is immediately converted by the enzyme heme oxygenase into biliverdin. It does not accumulate in the body.
Option D: While heme contains iron, a mineral, the body efficiently recycles and stores it as ferritin and hemosiderin. Free mineral accumulation is not the primary pathological consequence of hemolysis; bilirubin accumulation is.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain The physiological consequences of excessive red blood cell breakdown (hemolysis) as background academic context rather than a clinical decision trigger.
This process is the basis for hemolytic jaundice, a key clinical sign nurses must recognize. It is distinct from other types of jaundice (hepatocellular or obstructive).
Nurses monitor patients with hemolytic conditions (e.g., sickle cell crisis, G6PD deficiency, autoimmune hemolytic anemia) for signs of jaundice, fatigue, and dark urine (from increased urobilinogen), which indicate a high rate of RBC destruction.
Monitoring serum bilirubin levels is a crucial nursing responsibility in these patients, especially in newborns, where high levels of unconjugated bilirubin can be neurotoxic (kernicterus).

How to Approach the Question

First, understand the core process in the question: 'Excessive hemolysis' means 'too many red blood cells breaking down'.
Recall or deduce the fate of the components of a red blood cell, specifically hemoglobin.
Trace the breakdown pathway of hemoglobin: It splits into heme and globin. Globin is recycled. Heme is the part that needs to be excreted.
Follow the heme breakdown pathway: Heme is converted to bilirubin. This is the key product that must be processed by the liver.
Consider the effect of an 'excessive' rate. If the production of bilirubin exceeds the liver's processing capacity, it will accumulate. Therefore, bilirubin is the substance that builds up.
Evaluate the other options to confirm your choice. Globulin is recycled, heme is an intermediate, and minerals (iron) are stored. This confirms bilirubin is the most logical answer.

Concept Tested & Keywords

Concept Tested: The physiological consequences of excessive red blood cell breakdown (hemolysis).
Stem keywords: Excessive hemolysis, accumulation, substance
Lead-in keywords: which
Negative lead-in flag: false

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