Ключевые слова: anatomy, background, biology, body, cardiac, cell, column arch, contraction, cross, disks, education, fiber, fibers, fibre, heart, hematoxylin, histological, histology, human, intercalated, line, mammal, medicine, micro, micrograph, microscope, microscopy, muscle, muscles, muscular, myocardiocyte, myocardium, myocyte, myocytes, myofibril, nucleus, pattern, science, section, showing, skeletal, smooth, stained, striated, structure, system, texture, tissue, types, under,