Which is the hormone-secreting part of the pancreas?

Appeared in: MP CHO - 2022

Explanation

The Islets of Langerhans are clusters of specialized endocrine cells embedded within the exocrine tissue of the pancreas.
These islets are responsible for producing and secreting key hormones directly into the bloodstream to regulate metabolism.
The primary hormones secreted are insulin (from beta cells) and glucagon (from alpha cells), which work together to maintain glucose homeostasis.
The image provided visually confirms this by showing the distinct cluster of endocrine cells (Alpha, Beta, Delta) separate from the surrounding exocrine acinar tissue.

Option A: Pinealocytes are not located in the pancreas. They are the main cells of the pineal gland in the brain.
Option C: Kupffer cells are not part of the pancreas. They are resident macrophages found in the liver sinusoids.
Option D: Polypeptide cells (PP cells) are only one of the four main types of hormone-secreting cells within the Islets of Langerhans. The Islet of Langerhans is the entire functional unit, not just one cell type.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Endocrine function of the pancreas as background academic context rather than a clinical decision trigger.
The health of the Islets of Langerhans is critical for glucose regulation. Dysfunction or destruction of the beta cells is the primary cause of Type 1 Diabetes Mellitus, leading to insulin deficiency and hyperglycemia.
Nurses frequently care for patients with diabetes, which involves monitoring blood glucose, administering insulin, and educating patients on managing a condition directly related to the function of the Islets of Langerhans.
What if? If a patient develops a tumor of the alpha cells (a glucagonoma), the answer would change from a problem of high blood sugar to one of persistently high glucagon levels. The nurse would monitor for hyperglycemia, weight loss, and a specific skin rash called necrolytic migratory erythema.

How to Approach the Question

First, identify the keywords in the question: 'hormone-secreting' and 'pancreas'. This directs you to the endocrine function of the organ.
Recall that the pancreas has two main functions: exocrine (digestive enzymes) and endocrine (hormones). The question specifically asks about the endocrine part.
Evaluate the options. 'Pinealocytes' and 'Kupffer cells' are located in the brain and liver, respectively, so they can be eliminated immediately.
Compare 'Islet of Langerhans' and 'Polypeptide cells'. Recognize that Polypeptide cells are a component within the Islets of Langerhans. The Islet is the complete structure, making it the best and most comprehensive answer.

Concept Tested & Keywords

QvGkIBHHRuY90XHnCgWkwK

E6 Physiology Guyton 4SAE Part 3 p. 1

E6 Histology Inderbir 11e p. 64-66

Practise the full MP CHO - 2022

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