Which of the following hormone is generally not produced by the placenta?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Thyroxin
Option (1) hCG — Produced by the placenta.
Option (2) hPL — Produced by the placenta.
Option (3) Thyroxin — Not produced by the placenta. Thyroxine comes from the thyroid gland; its level only rises during pregnancy.
Option (4) Estrogen — Produced by the placenta.
NCERT Extract:
Pregnancy and Embryonic Development – “… Placenta also acts as an endocrine tissue and produces several hormones like human chorionic gonadotropin (hCG), human placental lactogen (hPL), estrogens, progestogens, etc. In the later phase of pregnancy, a hormone called relaxin is also secreted by the ovary. Let us remember that hCG, hPL and relaxin are produced in women only during pregnancy. In addition, during pregnancy the levels of other hormones like estrogens, progestogens, cortisol, prolactin, thyroxine, etc., are increased severalfolds in the maternal blood.”