Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. This post has been updated. Whether or not you’ve resolved to get into shape this January, Muscle Month is here to teach you a thing or two about stretching, contracting, lifting, tearing, gaining, and so much more. Welcome to PopSci’s Muscle Month! We’re kicking off the season with an FAQ on all things muscle-related, based on popular internet searches and queries from members of our staff. Got a question we didn’t answer? Let us know on Twitter. What exactly is a muscle? Muscles form when specialized long and tubular cells, known as myocytes, band together in a process called myogenesis. These fibers are distributed throughout our bodies and come in many different shapes, sizes, and forms, says David Putrino, a physical therapist at the Icahn School of Medicine at Mount Sinai in New York and director of Rehabilitation Innovation for the Mount Sinai Health System. The human body has three types of muscle cells: Skeletal, smooth, and cardiac.
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