During spermatogenesis FSH is inhibited by –
**Core Concept**
Testicular production of inhibin, a peptide hormone, plays a crucial role in regulating the feedback inhibition of follicle-stimulating hormone (FSH) during spermatogenesis. Inhibin is produced by Sertoli cells in the testes in response to FSH stimulation.
**Why the Correct Answer is Right**
Inhibin acts on the pituitary gland to inhibit the release of FSH, creating a negative feedback loop. This mechanism is essential for maintaining the balance between FSH and testosterone levels, which is critical for spermatogenesis. As FSH levels decrease, Sertoli cells produce less inhibin, allowing FSH levels to rise and stimulate spermatogenesis. This feedback loop is a classic example of a negative feedback mechanism in endocrinology.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not relevant to the inhibition of FSH during spermatogenesis.
* **Option B:** This option is not directly related to the feedback inhibition of FSH.
* **Option C:** This option is incorrect because inhibin is the primary hormone responsible for inhibiting FSH during spermatogenesis, not testosterone.
**Clinical Pearl / High-Yield Fact**
Inhibin is a critical hormone in the regulation of spermatogenesis, and its deficiency can lead to impaired FSH regulation and abnormal testicular function. Understanding the negative feedback loop between inhibin and FSH is essential for diagnosing and managing disorders of spermatogenesis.
**Correct Answer: C. Inhibin**