Progesterone has how many carbons: (A) 18, (B) 19, (C) 20, (D) 21
Answer is D. Progesterone (P4)C21H30O2is an endogenous steroid and progestogen sex hormone involved in the menstrual cycle, pregnancy, and embryogenesis of humans and other species. It belongs to a group of steroid hormones called the progestogens and is the major progestogen in the body. Progesterone is also a crucial metabolic intermediate in the production of other endogenous steroids, including the sex hormones and the coicosteroids, and plays an impoant role in brain function as a neurosteroid.Ref: Ganong&;s review of medical physiology; 24th edition; page no:-409