The provided video explains about myofibers which is multinucleated single muscle cell and is the basic unit of skeletal muscle. Following this video you can learn the basic concepts easily along with diagrams. Timeline: 0:00:introduction 0:39:muscle cells 1:32:components of muscle cells 2:51:sarcoplasmic reticulum 7:53:myofibrils 8:42:components of myofibrils 9:30:contractile proteins 11:27:regulatory proteins 12:50:sarcomere 14:19:sliding filament mechanism 15:23:structural proteins 17:43:questions