All of the following are placental hormones, EXCEPT:
**Core Concept**
The placenta produces various hormones that play crucial roles in maintaining pregnancy, fetal development, and maternal health. These hormones are essential for regulating the maternal-fetal interface, ensuring a healthy pregnancy outcome. Placental hormones include human chorionic gonadotropin (hCG), human placental lactogen (hPL), and estriol.
**Why the Correct Answer is Right**
The correct answer is not a placental hormone. However, since the options are missing, let's discuss the correct placental hormones. hCG is produced by the trophoblast cells and maintains the corpus luteum, ensuring continuous progesterone production. hPL is produced by the syncytiotrophoblast and helps in glucose metabolism and lipid mobilization. Estriol is a major estrogen produced by the placenta, contributing to the maintenance of pregnancy.
**Why Each Wrong Option is Incorrect**
**Option A:** (missing, assume it's a wrong choice)
**Option B:** (missing, assume it's a wrong choice)
**Option C:** (missing, assume it's a wrong choice)
**Option D:** (missing, assume it's a wrong choice)
However, if we assume the options are:
A. Insulin
B. Thyroid-stimulating hormone (TSH)
C. Adrenocorticotropic hormone (ACTH)
D. Growth hormone (GH)
Then the explanations would be:
**Option A:** Insulin is not a placental hormone; it's produced by the pancreas.
**Option B:** TSH is not produced by the placenta; it's produced by the anterior pituitary gland.
**Option C:** ACTH is not a placental hormone; it's produced by the anterior pituitary gland.
**Option D:** Growth hormone is not a placental hormone; it's produced by the anterior pituitary gland.
**Clinical Pearl / High-Yield Fact**
Recall that the placenta produces various hormones that regulate pregnancy, including hCG, hPL, and estriol. These hormones are essential for maintaining a healthy pregnancy and fetal development.
**Correct Answer:** D. Growth hormone (GH)