Question:
Which of the following hormone is not secreted by human placenta:
Which of the following hormone is not secreted by human placenta:
Updated On: Jul 14, 2026
- Estrogen
- hCG
- LH
- Progesterone
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The Correct Option is C
Approach Solution - 1
The correct option is (C): LH.
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Approach Solution -2
The question asks which hormone is NOT secreted by the human placenta. Let's check where each hormone actually comes from.
- Estrogen: The placenta is a major source of estrogen during pregnancy, especially estriol, and its levels rise steadily as pregnancy progresses.
- hCG: Human chorionic gonadotropin is produced by the trophoblast cells of the placenta from very early in pregnancy, and it keeps the corpus luteum active so it continues making progesterone until the placenta can take over.
- LH: Luteinizing hormone is made by gonadotroph cells in the anterior pituitary gland, not by the placenta. During pregnancy, pituitary LH secretion is actually suppressed, and hCG takes over its role of supporting the corpus luteum.
- Progesterone: The placenta becomes the main source of progesterone after the first trimester, maintaining the uterine lining and preventing contractions until closer to delivery.
Estrogen, hCG, and progesterone are all placental hormones, while LH comes from the pituitary gland and is not made by the placenta at all.
Therefore, the correct answer is LH.
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