Question

In stallion, testosterone is produced by

• A. Leydig cells
• B. Seminiferous tubules
• C. Epididymis
• D. Prostate Gland

Hint:

Remember the classic hormonal axis in male reproduction:
- LH acts on Leydig cells to produce Testosterone.
- FSH acts on Sertoli cells to stimulate Spermatogenesis and produce Inhibin.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Testosterone is the primary male sex hormone responsible for spermatogenesis, accessory sex gland function, and male secondary sexual characteristics.
It is synthesized within specialized cells in the testes.

Step 2: Detailed Explanation:
In stallions, Leydig cells (interstitial cells of Leydig) are the primary cells responsible for testosterone production.
These cells are located in the interstitial tissue between the seminiferous tubules.
They contain luteinizing hormone (LH) receptors on their plasma membranes.
Binding of LH stimulates the intracellular synthesis of cholesterol and its conversion into testosterone via enzymatic pathways.
Let us review the other structures:
- The Seminiferous tubules contain Sertoli cells, which support spermatogenesis and produce inhibin and estrogens, but do not secrete testosterone.
- The Epididymis is responsible for sperm transport, concentration, maturation, and storage, but does not produce testosterone.
- The Prostate gland is an accessory sex gland that contributes to seminal fluid volume, but does not synthesize testosterone.
Therefore, only Leydig cells (A) are responsible for testosterone production.

Step 3: Final Answer:
Testosterone in stallions is produced by Leydig cells.