The two major types of fiber arrangements are parallel and pennate.

Name: The two major types of fiber arrangements are parallel and pennate.
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Muscle fibers are organized into two major types of arrangements: parallel, where fibers run parallel to the force-generating axis, and pennate, where fibers are oriented at an angle to the force-generating axis, allowing for more fibers (and thus more force) in a given muscle volume.

The Two Major Types of Fiber Arrangements Are Parallel and Pennate