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Question


The muscles become shorter and thicker because of ________ .


Options:
A .   contraction
B .   relaxation
C .   extension
D .   tearing
Answer: Option A
:
A
When contracted, muscles become shorter, stiffer and thicker. The exact opposite effect takes place during relaxation. They become elongated and loose. The contraction of a muscle pulls bone towards it. Muscles can only pull bones. So, two muscles work together in moving a bone.

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