video1.0<iframe src="https://www.loom.com/embed/4fad0a1447024af19929d06c90bb7217" frameborder="0" width="1662" height="1246" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>12461662Loomhttps://www.loom.com12461662https://cdn.loom.com/sessions/thumbnails/4fad0a1447024af19929d06c90bb7217-dea067c889b86f61.gif1089.256This Loom reviews muscle anatomy and how muscles function to produce movement. It explains the three muscle types: skeletal muscle with parallel multinucleate fibers, cardiac muscle with short branching cells, one nucleus per myocardiocyte, and intercalated discs with gap junctions and desmosomes, and smooth muscle which is spindle-shaped, one nucleus, involuntary, and found in hollow organs, eyes, blood vessels, and airways. It covers muscle movement terminology including origin as the fixed bone and insertion as the moving bone, plus agonist, antagonist, synergist, and fixator. The video also describes lever classes, naming muscles by location, shape, size, fiber direction, number of heads, attachments, and action, and summarizes connective tissue layers and sarcomere structures. Clinical tie-ins include Duchenne muscular dystrophy due to dystrophin defects and statin-induced myopathy affecting calcium handling, with CK rising as a marker of muscle fiber breakdown such as in rhabdomyolysis.