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The lengthening of a muscle is called 'relaxing'. As the SHORT muscles work antagonistically- when one contracts, one relaxes. Therefore as one muscle shortens the other lengthens. This is between the bicep and tricep and the hamstring and quadricep. When a muscle shortens it also thickens, this is why you can feel your muscle rise when you bring your arm towards you.

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12y ago
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11y ago

as a eccentric contraction

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11y ago

it extends

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Q: When muscles lengthen?
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Contractile proteins is the term that identifies the proteins that allow muscles to shorten or lengthen.


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Contractile proteins is the term that identifies the proteins that allow muscles to shorten or lengthen.


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Muscles on one side of the joint have to relax in order for the muscles on the other side of the joint to contract. Example would be the quadriceps would have to relax and lengthen in order for the hamstrings to flex.


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The base word for lengthen is long > length > lengthen


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