Assertion: muscle fiber's myofibril | /r/HasProperty | actin & myosin filaments
Facets:
Source sentences:
text: Stress caused from various modes of training will influence a muscle’s myofibril composition (a myofibril is composed of actin & myosin filaments), which is what helps fibers earn their titles of Type I, IIA, and IIX.
text: The myofibrils are composed of actin and myosin filaments, repeated in units called sarcomeres, which are the basic functional units of the muscle fiber.