Collagen fibers in the connective tissue position themselves along the same plane of force as the tension as the tension increases.
According to this notion, a muscle contracts when filaments are let to rub up against one another. Thus, contractile force can result from this contact. But since a muscle must actually shorten, the sarcomere structure is quite important in this hypothesis.
The sarcomere, the fundamental unit of contraction in the muscle fiber, is where the stretching of a muscle fiber starts (see section Muscle Composition). The area where the thick and thin myofilaments overlap grows as the sarcomere shrinks. This overlap area shrinks when the muscle fiber extends, allowing the fiber to lengthen.
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