The muscles become shorter and thicker because of ________.

contraction

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relaxation

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extension

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tearing

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Solution

The correct option is A contraction
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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The muscles become shorter and thicker because of contraction.

The muscles become shorter and thicker because of

Read the following statements about muscle contraction in humans:

i. Chemical energy is converted into mechanical energy during muscle contraction

ii. Acetylcholineeasterase is an enzyme that catalyzes the production of acetylcholine

iii. In a contracted muscle, volume remains the same.

iv. A contracted muscle becomes shorter and thicker.

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