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Essay Galaxy - Types of Muscle
Types of Muscle
Muscle, tissue or organ of the body characterized by the ability to contract, usually in response to a stimulus from the nervous system. The basic unit of all muscle is the myofibril, a minute, threadlike structure composed of complex proteins. Each muscle cell, or fiber, contains several myofibrils, which are composed of regularly arranged myofilaments if two types, thick and thin. Each thick myofilament contains several hundred molecules of the protein myosin. Thin filaments contain two strands of the protein actin. The myofibrils are made up of alternating rows of thick and thin myofilaments with their ends interleaved.
Humans have over 650 muscles, which differ in size according to the jobs they do. These muscles constitute 40% of body weight. The special function of muscle tissue is contraction. There are three di....
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Number Of Pages: 6 |
Number Of Words: 1451 |
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