The striated banding pattern in muscle fibers results from the arrangement of actin and myosin filaments within sarcomeres. The widths of light (I) and dark (A) bands change during contraction as Z-lines move closer, increasing actin-myosin overlap.
El patrón de bandas estriadas en las fibras musculares se debe a la disposición de los filamentos de actina y miosina en los sarcómeros. Las bandas claras (I) y oscuras (A) cambian de anchura durante la contracción a medida que las líneas Z se acercan, aumentando el solapamiento de actina y miosina.
| Front | Describe how the structure of a sarcomere explains the banding pattern seen in muscle fibres and the difference in width of bands depending on the degree of contraction. |
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| Back | Sarcomere & histology:
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