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내용필수	웹에디터 시작 > > > <p>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.</p><br/><br/><p>Smooth muscles line the inside of all our hollow organs like the intestines and the stomach. That’s except for the heart, which contains cardiac muscles (hence the name). Both cardiac and smooth muscles are involuntary, meaning we can’t tell them to tense or relax. Instead their movement is regulated by a precise neural dance formulated by our autonomic nervous system. The muscles that most of us are familiar with, says Putrino, are the skeletal muscles. They include well-known ones like the hamstrings, quadriceps, calves, and illusive external and internal obliques. So, just to clarify, is the heart an organ or a muscle? The heart is an organ, albeit a complex one. Again, it contains a distinct type of muscle called a cardiac muscle, which is only found in the heart, and makes up the main tissue within it, says Putrino. What about the brain? The brain is not a muscle at all.</p><br/><br/><p>It’s an organ made up of neural tissue. However, Buy Prime Boosts you can still "work out" your brain, so to speak, to strengthen certain cognitive functioning, like memory and attention. Okay, so how many muscles do we have? And what’s the biggest one? What about the smallest? Approximately 639 muscles make up the human body. The aptly-named gluteus maximus is the largest one in the body. You can thank your gluteus maximus <a href="http://speed.phorum.pl/viewtopic.php?f=3&t=466548">performance enhancer for men</a> a movement known as the hip extension which allows us humans to perform basic functions like walking and standing-as well as more extreme endeavours like running. The smallest muscle in the human body is the stapedius muscle, says Putrino. But never judge anything by its size: This tiny beast sits inside the ear and stabilizes the smallest bone in the body, the stapes, which is responsible for allowing us to hear the world around us. <a href="https://www.ft.com/search?q=Speaking">Speaking</a> of tiny muscles, does it really take more muscles to frown than it does to smile?</p><br/><br/><span style="display:block;text-align:center;clear:both"><iframe width="640" height="360" src="https://www.youtube.com/embed/odAEynBcw9Y?showinfo=0&rel=0&color=white" frameborder="0" allowfullscreen title="Hidden Viagra found in male enhan > > 웹 에디터 끝
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