Final answer:
Human Chorionic Gonadotropin (hCG) is a hormone produced during pregnancy that helps maintain the corpus luteum and elevated levels of progesterone. It can be detected in urine and serum for pregnancy tests.
Step-by-step explanation:
Human Chorionic Gonadotropin (hCG) is a hormone produced by the chorion of the zygote that helps maintain the corpus luteum and elevated levels of progesterone. It is secreted during pregnancy and plays a crucial role in the development and maintenance of the pregnancy. hCG can be detected in urine and serum, making it useful for pregnancy tests.