Continuous administration of GnRH
**Core Concept**
Continuous administration of GnRH (Gonadotropin-releasing hormone) leads to a paradoxical effect, causing a decrease in the secretion of gonadotropins (LH and FSH) from the pituitary gland. This is in contrast to the initial surge in gonadotropin release observed with acute administration of GnRH.
**Why the Correct Answer is Right**
Continuous exposure to GnRH desensitizes the GnRH receptors in the pituitary gland, resulting in a decrease in the production of LH and FSH. This is due to the downregulation of GnRH receptors and the subsequent decrease in the expression of gonadotropin subunits (LHβ and FSHβ). The decrease in LH and FSH secretion leads to a decrease in the production of estrogen and testosterone in the ovaries and testes.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is a distractor and does not accurately describe the effect of continuous GnRH administration.
**Option B:** This option is incorrect as it states the opposite of the correct answer, which is that continuous GnRH administration leads to an increase in gonadotropin release.
**Option C:** This option is a distractor and does not accurately describe the effect of continuous GnRH administration.
**Clinical Pearl / High-Yield Fact**
The use of GnRH agonists, which cause continuous administration of GnRH, is a common treatment for conditions such as endometriosis, uterine fibroids, and prostate cancer. These medications can be used to induce a medical castration, reducing the production of sex hormones and alleviating symptoms.
**Correct Answer:** C.