Muscle Contraction Its so EASY

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Video describing the process of an action potential leading to muscle contraction (by the sliding filament theory). I do not own this song - I used the itunes karaoke version of You Belong With Me by Taylor Swift","styleRuns":[{"startIndex":0,"length":214,"styleRunExtensions":{"styleRunColorMapExtension":{"colorMap":[{"key":"USER_INTERFACE_THEME_DARK","value":4294967295},{"key":"USER_INTERFACE_THEME_LIGHT","value":4279440147}]}},"fontFamilyName":"Roboto"}]},"headerRuns":[{"startIndex":0,"length":214,"headerMapping":"ATTRIBUTED_STRING_HEADER_MAPPING_UNSPECIFIED"}]}},{"itemSectionRenderer":{"contents":[{"messageRenderer":{"text":{"runs":[{"text":"Comments are turned off. 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