Steroids are important lipids of our body. Our body contains steroid hormones as well. The video provides knowledge about classes of steroid hormones, their production, their working etc. TIMELINE: 0:00 Introduction 0:06 Five main classes of steroid hormones 0:58 Location of production of steroid hormones 1:18 How steroid hormones work? 1:43 Flow diagram 2:30 Main structural difference between cholesterol and pregnenolone