Endocrinology and Physiology
Published online by Cambridge University Press: 10 July 2020
Imagine the workings of a factory (Figure 15.1). The X-Cell-O corporation produces building materials, everything from steel beams to iron roofing to windows – the same sorts of material, in fact, of which the factory building itself is made; in a way we could almost say it reproduces itself. Iron ore and scrap metal are trucked in and shunted to the blast furnace, where they are melted. Impurities are skimmed off before the molten iron is poured into molds; the still-soft molded steel is then pressed between rollers to produce a thin sheet, much as dough is rolled out with a rolling pin. A series of rollers might shape some of the still-glowing, malleable steel into I-beams. Metal sheets are sent to stamping machines to shape them into window frames or iron roofing sheets. Finished products are shuttled to the dock for pick-up.
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