One hormone latches onto sugar in the bloodstream and then helps ferry that sugar into cells to fuel their work. Another hormone might let you know that you’re full. These instructions might cause the heart to pump more rapidly or signal hunger to the brain. It might direct a cell to change its shape or activity. That hormone might tell the cell to grow - or to stop. From there, the hormones travel far from the place they were made until they reach cells that read the chemical as an instruction. Various tissues of the body secrete hormones into fluids, like blood. But much of the work in crafting the traits that make each of us unique is performed by a family of chemicals known as hormones. Scientists like to attribute most of those traits to inherited genes. Some of us may have ended up short or tall, dark skinned or light, clever or slow, night owls or early birds. Along the way, that cell divided and morphed in very individual ways.
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