Question

Which of the following hormones is not secreted by human placenta?

• A. Progestogen
• B. HCG
• C. Estrogen
• D. LH

Hint:

Placental hormones play a vital role in maintaining pregnancy and supporting fetal development.

Answer 1

The Correct Option is D

The hormone not secreted by human placenta is LH (Luteinizing Hormone).

(A) Progestogen - Incorrect: Placenta secretes progesterone to maintain pregnancy.

(B) HCG - Incorrect: Human Chorionic Gonadotropin is the key placental hormone detected in pregnancy tests.

(C) Estrogen - Incorrect: Placenta produces estrogens (estriol) during pregnancy.

(D) LH - Correct: LH is secreted by the anterior pituitary, not placenta.

The correct answer is (D) LH, as this gonadotropin is exclusively of pituitary origin.

Answer 2

The human placenta secretes several important hormones that help maintain pregnancy, including:

• Progesterone: Maintains the uterine lining for pregnancy.
• HCG (Human Chorionic Gonadotropin): Stimulates the corpus luteum to secrete progesterone early in pregnancy.
• Estrogen: Supports the pregnancy and helps prepare the body for labor.
• LH (Luteinizing Hormone) is secreted by the anterior pituitary and regulates ovulation and the menstrual cycle but is not secreted by the placenta.

Option (D) is correct because LH is not secreted by the placenta.