Definition: HCG (human chorionic gonadotropin) is a hormone produced by an immature egg cell, typically between weeks 5-8 in humans, which plays a crucial role in fetal development and growth. It acts as a precursor for pregnancy hormones such as progesterone and estrogen. Definition: HCG is the primary human sex hormone that stimulates ovulation and growth of eggs. It's released by an immature female egg cell in response to seminal fluid (usually during ovulation or after menstruation) containing sperm, which then trigger the release of more mature follicular cells into the uterus. This process is known as corpus luteum (a specialized tissue in the reproductive organ that secretes and regulates estrogen). HCG also influences the growth and development of both uterine lining and placenta. HCG affects fetal growth and development, especially during early stages of pregnancy, through its effects on growth factors such as progesterone and follicle-stimulating hormone (FSH) to influence the development of various organs in the fetus.
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