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Discovery Health "How Your Heart Works"
Everyone knows that the heart is a vital organ. We cannot live without our heart. However, when you get right down to it, the heart is just a pump. A complex and important one, yes, but still just a pump.
Skeletal muscle
Skeletal muscle is a form of striated muscle tissue which is under the control of the somatic nervous system ; that is to say, it is voluntarily controlled. It is one of three major muscle types, the others being cardiac and smooth muscle . As their name suggests, most skeletal muscles are attached to bones by bundles of collagen fibers known as tendons . Skeletal muscle is made up of individual components known as myocytes , or "muscle cells", sometimes colloquially called "muscle fibers". They are formed from the fusion of developmental myoblasts (a type of embryonic progenitor cell that gives rise to a muscle cell). These long, cylindrical , multinucleated cells are also called myofibers .
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