Kupffer's cells are found in liver which act as?

Appeared in: NORCET 5 Prelims - Sept 2023 (Shift-1)

Explanation

Kupffer's cells are the resident macrophages of the liver, strategically lining the hepatic sinusoids.
As part of the mononuclear phagocyte system, their principal function is phagocytosis.
They actively engulf and destroy pathogens (like bacteria from the gut), cellular debris, and senescent (old) red blood cells that pass through the liver.
This blood-cleansing action is essential for protecting the body from systemic infection and maintaining homeostasis.

Option B: Pinocytosis is the process of ingesting fluid and solutes ('cell drinking'), which is a general cellular activity but not the specialized, primary function of Kupffer's cells.
Option C: While Kupffer's cells do secrete inflammatory mediators like cytokines, their defining role is phagocytosis, not secretion in the manner of a glandular or endocrine cell.
Option D: Kupffer's cells do not produce mucus. This function is carried out by specialized cells like goblet cells found in the respiratory and intestinal tracts.

Visual 1: Diagram: A liver sinusoid showing a Kupffer cell lining the vessel, with its pseudopods extending to engulf a bacterium from the bloodstream. This visualizes its phagocytic role and strategic location.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Function of Kupffer's cells in the liver as background academic context rather than a clinical decision trigger.
Kupffer's cells represent the first line of immune defense against pathogens absorbed from the gastrointestinal tract, preventing them from entering systemic circulation.
In patients with chronic liver disease (e.g., cirrhosis), impaired Kupffer cell function is a major contributor to the increased risk of spontaneous bacterial peritonitis and sepsis.
What if? If a patient develops portal hypertension secondary to cirrhosis, the shunting of blood away from the sinusoids means less blood is filtered by Kupffer's cells, dramatically increasing the risk of systemic bacteremia from gut-derived organisms.

How to Approach the Question

First, identify the key term in the question stem: 'Kupffer's cells'.
Recall the location and cell type associated with this term. Kupffer's cells are known to be macrophages located in the liver.
Next, recall the primary function of a macrophage. Macrophages are the 'big eaters' of the immune system, specialized in phagocytosis.
Scan the options to find the one that matches this primary function. 'Phagocytic' directly describes the main action of macrophages.
Eliminate the other options by contrasting their definitions with the known role of Kupffer's cells.

Concept Tested & Keywords

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Practise the full NORCET 5 Prelims - Sept 2023 (Shift-1)

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