All steroids are manufactured in cells from the sterols lanosterol ( opisthokonts) or cycloartenol (plants). Hundreds of steroids are found in plants, animals and fungi. Steroids have two principal biological functions: as important components of cell membranes that alter membrane fluidity and as signaling molecules. : 1785fĪ steroid (named after the steroid cholesterol which was first described in gall stones from Ancient Greek chole- ' bile' and stereos 'solid' ) is a biologically active organic compound with four rings arranged in a specific molecular configuration. Its core ring system (ABCD), composed of 17 carbon atoms, is shown with IUPAC-approved ring lettering and atom numbering. Structure of 24-ethyl-lanostane, a hypothetical steroid with 32 carbon atoms.
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