Location and secretion of Leydig cells are?

Appeared in: KPSC Staff Nurse - 2016

Explanation

Leydig cells, also known as interstitial cells, are located in the testes, specifically in the connective tissue found between the seminiferous tubules.
The primary function of Leydig cells is to synthesize and secrete testosterone, the principal male sex hormone.
This process is directly stimulated by Luteinizing Hormone (LH), which is released from the anterior pituitary gland.

Option A: The liver's primary cells for synthesis are hepatocytes, which produce cholesterol. Leydig cells are not found in the liver.
Option B: Estrogen is the primary female sex hormone, produced mainly by the granulosa and theca cells within the ovaries.
Option D: The pancreas secretes hormones like insulin and glucagon to regulate blood sugar. Glycogen is a storage form of glucose, primarily stored in the liver and muscles, not secreted by the pancreas.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Endocrine function of the male reproductive system, specifically Leydig cells as background academic context rather than a clinical decision trigger.
Understanding Leydig cell function is crucial for diagnosing and managing male hypogonadism (low testosterone), which can affect mood, energy, libido, and muscle mass.
Nurses often educate patients on testosterone replacement therapy, including administration methods and monitoring for potential side effects like polycythemia (increased red blood cells) or prostate issues.
What if? A male patient presents with low testosterone but high LH levels. This pattern suggests primary hypogonadism, meaning the problem is with the testes (Leydig cells are not responding to LH), rather than a pituitary or hypothalamic issue (secondary hypogonadism).

How to Approach the Question

First, identify the key term in the question: 'Leydig cells'.
Recall the primary function and location of Leydig cells from your study of the male reproductive system's endocrine functions.
Remember that Leydig cells are also called interstitial cells and are located in the testes.
Recall that their main role is to produce the primary male androgen, testosterone.
Scan the options to find the pair that matches this knowledge: 'Testis-testosterone'.
Briefly verify the other options are incorrect to confirm your choice (e.g., Liver makes cholesterol, Ovary makes estrogen, Pancreas makes insulin/glucagon).

Concept Tested & Keywords

Concept Tested: Endocrine function of the male reproductive system, specifically Leydig cells.
Stem keywords: Leydig cells, location, secretion
Lead-in keywords: are

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E6 Physiology Essentials Sembulingam 10e Part 2 p. 103-105

E6 Physiology Guyton 4SAE Part 3 p. 27-29

Practise the full KPSC Staff Nurse - 2016

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