Which hormone is produced by the Testes?

Raj. CHO -2020

Applied Physiology

Easy

Appeared in: Raj. CHO -2020

Explanation

Testosterone is the principal male sex hormone, belonging to the androgen group of steroid hormones.
It is primarily secreted by the interstitial cells of Leydig, which are located within the testes.
Its main functions include the development of male reproductive organs like the prostate and testes, and promoting secondary sexual characteristics such as increased muscle and bone mass, and the growth of body hair.
The secretion of testosterone is stimulated by Luteinizing Hormone (LH) from the anterior pituitary gland.

Option B: TSH, or Thyroid-Stimulating Hormone, is not produced by the testes. It is a pituitary hormone.
Option C: Cortisol is a steroid hormone, but it is produced by the adrenal glands, not the testes.
Option D: Insulin is a peptide hormone responsible for regulating blood sugar; it is not produced by the testes.

Visual 1: Diagram - A flowchart illustrating the Hypothalamic-Pituitary-Gonadal (HPG) axis, showing the roles of GnRH, LH, FSH, and testosterone, including the negative feedback loop.
Visual 2: Anatomical Illustration - A cross-section of a testis highlighting the location of the seminiferous tubules and the interstitial Leydig cells.

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 as background academic context rather than a clinical decision trigger.
Nurses monitor for signs of testosterone deficiency (hypogonadism), which can include fatigue, decreased libido, and loss of muscle mass. This is crucial in adult male patients presenting with these symptoms.
Understanding the source of hormones is vital for differential diagnosis. If a male patient has symptoms of low testosterone but high LH levels, it suggests a primary testicular failure, as the pituitary is trying to stimulate unresponsive testes.
What if? - If a patient were taking high doses of external (exogenous) testosterone for bodybuilding, the nurse would expect to see very low levels of LH. This is because the high external testosterone levels would strongly inhibit the pituitary's production of LH through the negative feedback mechanism of the HPG axis.

How to Approach the Question

First, identify the core question, which is asking for the hormone produced by a specific organ: the testes.
This is a factual recall question from endocrinology. Access your knowledge about the major endocrine glands and the hormones they produce.
Evaluate each option. Think about where each hormone is primarily produced.
Option A: Testosterone. Recall that this is the primary male sex hormone, produced in the testes.
Option B: TSH. Recall this stands for Thyroid-Stimulating Hormone, which points to the pituitary-thyroid axis.
Option C: Cortisol. Recall this is the main glucocorticoid, associated with the adrenal glands.

Concept Tested & Keywords

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