The basic fused ring structure and numbering system of a steroid is shown. The derivation of steroids, specifically lanosterol, from the building block triterpene squalene is presented. The structures and functionality of specific examples of the androgens, (male sex hormones), the estrogens, (female sex hormones), the progestins, (hormones involved in pregnancy and the cortisteroids is presented.

00:00 Lipids
00:08 Nonsaponifiable Lipids
00:31 Steroids & Ring Structure
02:51 Squalene
03:05 Steroids from Squalene
10:30 Lanosterol
12:11 Cholesterol
13:37 Bile Acids
15:58 Pregnenolone
16:27 Androgens, Estrogens & Progestins
18:35 Androgens
19:16 Testosterone
19:35 Androsterone
21:21 Methandrostenolone
21:55 Estrogens
22:54 Estradiol
23:31 Estrone
24:06 Progestins
25:15 Progesterone
26:10 Norethynodrel
27:26 Norethindrone
29:04 Ethynylestradiol Diacetate
29:41 Cortisteroids
30:38 Cortisone
31:01 Cortisol
31:47 Prednisone

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