True. Human chorionic gonadotropin (hCG) is a glycoprotein hormone produced by the syncytiotrophoblast cells of the developing placenta shortly after implantation. Its critical function is to maintain the corpus luteum in the ovary during early pregnancy. The corpus luteum produces progesterone, which is essential for maintaining the endometrium and supporting the early embryo. hCG acts like LH, binding to the LH receptors on the corpus luteum and preventing its regression. hCG levels rise rapidly in early pregnancy, peaking around 8-11 weeks, and are the basis for all pregnancy tests. It is also produced by some tumors (like choriocarcinoma, germ cell tumors), leading to ectopic hCG production. The syncytiotrophoblast is the outer layer of the chorionic villi, which are in direct contact with maternal blood.

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