Which of the following is/are a major pancreatic protease(s) in the exocrine pancreas?

Appeared in: NHM UP Staff Nurse-2023 Shift-2nd

Explanation

The exocrine pancreas secretes digestive enzymes into the duodenum.
Proteases are enzymes that specifically break down proteins.
Trypsin and chymotrypsin are the main proteases produced by the pancreas.
They are secreted as inactive zymogens (trypsinogen and chymotrypsinogen) and are activated in the small intestine to begin protein digestion.

Option A: Bicarbonate is an alkaline substance, not an enzyme. Its function is to neutralize stomach acid in the duodenum.
Option B: Insulin and glycogen are involved in the endocrine function of the pancreas, which regulates blood sugar. They are not exocrine digestive enzymes.
Option D: Amylase is a digestive enzyme secreted by the exocrine pancreas, but it is an amylolytic enzyme, meaning it digests carbohydrates (starches), not proteins.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Digestive enzymes of the exocrine pancreas as background academic context rather than a clinical decision trigger.
Understanding the function of pancreatic proteases is crucial for recognizing the pathophysiology of acute pancreatitis. In this condition, proteases like trypsin become prematurely activated within the pancreas, leading to autodigestion, inflammation, and severe pain.
In conditions of exocrine pancreatic insufficiency (EPI), such as in cystic fibrosis or chronic pancreatitis, the lack of these enzymes leads to maldigestion of proteins and fats, causing steatorrhea, weight loss, and malnutrition.
What if the patient has cystic fibrosis? The thick mucus characteristic of CF can block the pancreatic ducts. This prevents trypsin, chymotrypsin, and other enzymes from reaching the intestine, leading to severe maldigestion. These patients require pancreatic enzyme replacement therapy (PERT) with meals to digest food properly.

How to Approach the Question

First, identify the key terms in the question: 'major', 'pancreatic protease', and 'exocrine pancreas'.
The term 'protease' tells you to look for an enzyme that digests proteins.
The term 'exocrine pancreas' specifies the part of the pancreas that releases substances into a duct for digestion, as opposed to the endocrine part that releases hormones into the blood.
Evaluate each option based on these keywords.
Option A, Bicarbonate, is a buffer, not a protein-digesting enzyme.
Option B, Insulin and glycogen, are related to the endocrine function of blood sugar control.

Concept Tested & Keywords

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E6 Medicine Harrison 22e Part 2 p. 647-649

E6 Physiology Guyton 4SAE Part 2A p. 173-175

E6 Nelson Textbook of Pediatrics(2024) — Volume 2 p. 206-208

Practise the full NHM UP Staff Nurse-2023 Shift-2nd

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