ANSWERS: 1
  • The I bands, which are the "light" bands formed by the sections of the sarcomere that contain only actin, and would only be seen in a relaxed muscle. Once a muscle contracts, the sarcomere shortens, and the actin filaments slide together, making the light I bands virtually disappear. This leaves only the dark A bands visible, so that an electron micrograph of a contracted muscle consists of mostly dark bands.

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