What is the main function of the liver?

Appeared in: P.CHO-2019

Explanation

The liver's primary digestive function is to produce and secrete bile, typically 600 to 1000 mL per day.
Bile is essential for fat digestion and absorption. It contains bile salts that emulsify large fat particles into smaller ones, increasing the surface area for digestive enzymes (lipases) to act upon.
Bile also serves as a crucial pathway for the body to excrete waste products, particularly bilirubin (a byproduct of red blood cell breakdown) and excess cholesterol.

Option A: Insulin is a hormone, not a digestive secretion in the same category as bile or gastric juice. It is produced by the beta cells within the islets of Langerhans in the pancreas.
Option C: Gastric juice is secreted by specialized glands within the lining of the stomach, not the liver. Its main components are hydrochloric acid and pepsin.
Option D: This option is incorrect because only one of the listed functions, the production of bile, is performed by the liver. The other functions are carried out by the pancreas and stomach.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Primary digestive function of the liver as background academic context rather than a clinical decision trigger.
Impaired bile production or flow (cholestasis) leads to malabsorption of fats and fat-soluble vitamins (A, D, E, K), resulting in symptoms like steatorrhea (fatty stools) and potential vitamin deficiencies.
When bile cannot be excreted properly, bilirubin builds up in the blood, causing jaundice (yellowing of the skin and eyes), pale or clay-colored stools, and dark urine.
Nurses monitor liver function through blood tests (Liver Function Tests or LFTs) which measure liver enzymes (ALT, AST), bilirubin, and proteins like albumin to assess for liver damage or disease.

How to Approach the Question

This is a factual recall question testing knowledge of basic organ physiology.
First, identify the key organ in the question: the liver.
Second, recall the primary functions associated with the liver, particularly its main role in the digestive system.
Third, systematically evaluate each option against your knowledge of anatomy and physiology:
Option A: Insulin is produced by the pancreas.
Option B: Bile is produced by the liver.

Concept Tested & Keywords

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E6 Physiology Guyton 4SAE Part 2A pp. 181-183, 180-182

E6 Medicine Davidson Principles Practice 24e p. 870-872

Practise the full P.CHO-2019

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