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Heavy Load (2008) IMDB rating: 7.20 Plot: A year in the life of punk band, Heavy Load, whose members include some musicians with learning disabilities.

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Why don't muscles detach from bones when we lift heavy loads?

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The framework of the muscle is a continuation of the very tough connective tissue sheath that surrounds the bone (periosteum). So the tendon that holds the muscle to the bone is almost part of the bone itself.
Asst Prof | Nov 16, 2009

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Muscles are attached very strongly to bones connective tissues called tendons (chord-like or rope-like) and aponeuroses (sheet-like).
bulletslace | Nov 16, 2009

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Feedback from pain fibers, especially those associated with stretch receptors in the tendons, inhibits over-application of force.
novangelis | Nov 16, 2009