Beta HCG is secreted by
In molecular biology, human chorionic gonadotropin (hCG) is a hormone produced by the syncytiotrophoblast, a component of the feilized egg, after conception. Following implantation, the syncytiotrophoblast gives rise to the placenta.Ref: Ganong&;s review of medical physiology; 24th edition; page no:-414
Ovary
Pituitary
Corpus luteum
Placenta
Endocrinology