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Stretching FAQ 1.2 - Muscle CompositionStretching FAQ 1.2 - Muscle Composition
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Subject: 1.2 - Muscle Composition
Muscles vary in shape and in size, and serve many different purposes. Most large muscles, like the hamstrings and quadriceps, control motion. Other muscles, like the heart, and the muscles of the inner ear, perform other functions. At the microscopic level however, all muscles share the same basic structure.
At the highest level, the (whole) muscle is composed of many strands of tissue called "fascicles". These are the strands of muscle that we see when we cut red meat or poultry. Each fascicle is composed of "fasciculi" which are bundles of "muscle fibers". The muscle fibers are in turn composed of tens of thousands of thread-like "myofybrils", which can contract, relax, and elongate (lengthen). The myofybrils are (in turn) composed of up to millions of bands laid end-to-end called "sarcomeres". Each sarcomere is made of overlapping thick and thin filaments called "myofilaments". The thick and thin myofilaments are made up of "contractile proteins", primarily actin and myosin.
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