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Pregnancy can be confirmed by detecting the presence of human chorionic gonadotropin (HCG) in blood or urine of pregnant woman. HCG is a hormone produced by the placenta after implantation. HCG plays an essential role in maintenance of corpus luteum and allows secretion of the progesterone and estrogen hormone. Progesterone enriches the uterus with a thick lining of blood vessels and capillaries so that it can sustain the growing foetus.

1. (a) HCG is a hormone produced by the placenta after implantation.
2. (b) HCG plays an essential role in maintenance of corpus luteum.
3. (c) HCG allows secretion of the progesterone and estrogen hormone.
4. (d) Progesterone enriches the uterus with a thick lining of blood vessels and capillaries.

Correct answer: (a) HCG is a hormone produced by the placenta after implantation.

Solution

The correct choice is the statement that identifies HCG as being produced by the placenta after implantation. The other options describe HCG’s functions or progesterone’s effects, not the defining fact asked for.

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