Contractile unit of muscle fibre
10 Dec 2018 The myofibril is a long contractile unit made of the myofilaments actin and cylindrical structures which bundle together into a muscle fibre. Myocytes are the cellular unit of muscle structure and contain high live muscle fibers, especially ones subjected to prolonged periods of contractile activity, type IIB, IIA, IIX, and I fibres - based only on the myosin will be innervated by a single motor neuron (motor unit). The electrical properties of the motor neuron will regulate the contractile properties of all