smooth muscle tissue

muscle fiber epithelial nonstriated striations myosin cardiac cell energy animal tissue white myofilaments multiple nuclei intercalated disc smooth multinucleate skeletal fibers conductive thin filaments innervation anatomy gap junctions intermediate filament fabric cellular anatomical thick organ autonomic health care dense bodies disease masculine single receptor healthy movement school assignment human muscular system colorful worksheet background biology lab lesson structure study education vector science medicine nucleus contraction musculoskeletal striated red medical graphic design class