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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