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A '''muscle''' is made of a bundle of muscle fibers. These fibers can be extremely long, up to about 14 inches in the leg, or very short, fractions of an inch. Within the muscle fiber are thousands of parallel structures called mycofibrils. The mycofibrils contain two types of filaments (actin and mycosin) that cause the contractions of the muscle. These interlocking filaments can shorten by grabbing on to each other and pulling together; this is a muscle contraction.
A '''muscle''' is made of a bundle of muscle fibers. These fibers can be extremely long, up to about 14 inches in the leg, or very short, fractions of an inch. Within the muscle fiber are thousands of parallel structures called mycofibrils. The mycofibrils contain two types of filaments (actin and mycosin) that cause the contractions of the muscle. These interlocking filaments can shorten by grabbing on to each other and pulling together; this is a muscle contraction.
[[Image:Illu muscle tissues.jpg|right|thumb|300px|3 types of muscle tissues.]]
[[Image:Illu muscle tissues.jpg|right|thumb|300px|3 types of muscle tissues.]]