In the liver bacteria that found their way into portal circulation is destroyed by?

ESIC Nursing Officer - 2019 (Shift-2)

Applied Physiology

Easy

Appeared in: ESIC Nursing Officer - 2019 (Shift-2)

Explanation

Kupffer cells are the resident macrophages of the liver, forming a critical part of the mononuclear phagocyte system.
They are located within the liver sinusoids, the small blood vessels in the liver.
Their primary function is to filter blood coming from the portal vein, which drains the intestines.
They use phagocytosis to engulf and destroy bacteria, cellular debris, and other foreign particles, preventing them from entering the systemic circulation and causing sepsis.

Option B: Cilia are motile, hair-like projections, not phagocytic cells. Their function is to move substances along a surface.
Option C: Hydrochloric acid is a digestive fluid produced in the stomach. It is not present in the liver and does not filter blood.
Option D: Leukocytosis is a condition of having a high white blood cell count, often in response to an infection. It is not a specific cell type or structure within the liver.

Visual 1: Diagram of a liver sinusoid. The diagram should clearly show the endothelial lining with a star-shaped Kupffer cell attached, extending into the sinusoid to interact with blood flow from the portal vein.
Visual 2: Infographic of the Mononuclear Phagocyte System. This visual can show a map of the human body with different organs (liver, lung, brain, skin) and label the specific resident macrophage for each (Kupffer cell, alveolar macrophage, microglia, etc.).

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Hepatic Immune Function and Kupffer Cells as background academic context rather than a clinical decision trigger.
The phagocytic action of Kupffer cells is a vital defense mechanism against sepsis originating from the gut. It prevents bacteria that cross the intestinal barrier from causing systemic infections.
In patients with severe liver disease, such as cirrhosis, the function of Kupffer cells is impaired. This dysfunction, combined with altered blood flow (portal hypertension), significantly increases the risk of life-threatening infections like Spontaneous Bacterial Peritonitis (SBP) and bacteremia.
What if the patient has advanced cirrhosis? Their impaired Kupffer cell function makes them highly susceptible to infections. Nurses must monitor these patients closely for signs of infection (fever, abdominal pain, altered mental status) as it can be a sign of SBP, a medical emergency.

How to Approach the Question

First, identify the key terms in the question: 'liver', 'bacteria', and 'portal circulation'. This directs you to a process happening specifically within the liver involving the immune system and blood from the gut.
The question asks what 'destroys' the bacteria, pointing to a cellular or chemical agent.
Evaluate each option based on this context:
Kupffer cells: Recall or recognize these as the specialized immune cells (macrophages) of the liver.
Cilia: Associate these with the respiratory or reproductive tracts, not the liver.
Hydrochloric acid: Associate this with the stomach and digestion.

Concept Tested & Keywords

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