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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 - Wikipedia, the free encyclopedia
Skeletal muscle is a form of striated muscle tissue existing under control of the somatic nervous system , that is 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 composed of myofibrils .
Human Anatomy Online
To see detailed human anatomy charts and gather in-depth anatomy information, click any of the human body systems above. Where would you like to begin your exploration of human anatomy? Learn about human physiology as you study anatomical charts and models of every system in the human body!
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