Which part of the pancreas secretes insulin?

Appeared in: MP CHO -2019 (Shift-2)

Explanation

The pancreas has both exocrine (digestive) and endocrine (hormonal) functions.
The endocrine function is performed by the Islets of Langerhans, which are clusters of specialized cells.
Within the Islets of Langerhans, the beta (β) cells are responsible for synthesizing and secreting insulin.
Insulin is a crucial hormone that lowers blood glucose levels by helping cells absorb glucose from the blood for energy or storage.

Option A: The glomerulus is a part of the kidney's nephron, not the pancreas. It is a capillary network responsible for filtering blood to form urine.
Option B: Bowman's capsule is a structure in the kidney's nephron that surrounds the glomerulus to collect the filtered fluid (filtrate). It is not part of the pancreas.
Option D: The Loop of Henle is a part of the renal tubule in the kidney's nephron. Its function is to create a concentration gradient in the medulla of the kidney, which is essential for reabsorbing water and concentrating urine.

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 and insulin secretion as background academic context rather than a clinical decision trigger.
Understanding the source of insulin is fundamental to comprehending the pathophysiology of Type 1 Diabetes, where the beta cells are destroyed, leading to an absolute insulin deficiency.
Nurses frequently administer insulin and must monitor patients for signs of both hyperglycemia (high blood sugar) and hypoglycemia (low blood sugar), which can be a side effect of insulin therapy.
What if? If a patient's pancreas is surgically removed (pancreatectomy), they will lose both exocrine and endocrine functions. This results in 'surgical diabetes' and requires lifelong insulin replacement therapy and pancreatic enzyme supplements.

How to Approach the Question

First, identify the key terms in the question: 'pancreas' and 'secretes insulin'.
This is a factual recall question requiring knowledge of the endocrine system.
Recall the basic anatomy and physiology of the pancreas. Remember it has two main functions: exocrine (digestive enzymes) and endocrine (hormones).
Focus on the endocrine part. The hormone-producing cells are located in the Islets of Langerhans.
Evaluate the options. Recognize that 'Glomerulus', 'Bowman's capsule', and 'Loop of Henle' are all parts of the kidney's nephron, immediately eliminating them as incorrect.
This leaves 'Islets of Langerhans' as the only plausible answer related to the pancreas's endocrine function.

Concept Tested & Keywords

QLH6VVOnMkUJHry_lE63ta

E6 Physiology Guyton 4SAE Part 3 p. 1

E6 Physiology Essentials Sembulingam 10e Part 2 p. 61-63

E6 Anatomy BDChaurasia V2 10e Part 2 p. 76-78

Practise the full MP CHO -2019 (Shift-2)

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