Progesterone has how many carbons
18
19
20
21
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
Endocrinology