The muscle fiber typethat contains densely packed myofibrils, large glycogen reserves, and relatively few mitochondria, is called ________.

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Fast fibers contain densely packed myofibrils, large glycogen reserves, and relatively few mitochondria, which allows for quick and powerful contractions. Slow fibers, on the other hand, have more mitochondria and are better suited for endurance activities. Intermediate fibers have characteristics between those of fast and slow fibers. Cardiac and smooth fibers have different structures and functions than skeletal muscle fibers.

The Muscle Fiber Typethat Contains Densely Packed Myofibrils, Large Glycogen