I band region are flexible and function as "elastic bands" that counteract passive stretching of a muscle and influence its shortening velocity.

The extensibility of titin molecules, which can stretch to up to around ten times their normal length in skeletal muscle and somewhat less in cardiac muscle, is mainly due to frequent repetition of the PEVKmotif (proline-glutamate-valine-lysine). In very strong muscle extension, which represents the ¡5 steepest part of the resting extensibility curve (^ D), 5 globular chain elements called immunoglobulin C2 domains also unfold. The quicker the muscle ™ stretches, the more sudden and crude this type of "shock absorber" action will be.

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