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The muscular system is an active part of the musculoskeletal system.

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Muscles are between our bones and skin and they are joined to our bones through tendons.

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They are elastic organs that can be lengthened or shortened causing some body part movements.

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Us humans have approximately 630 muscles.

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According to the movements that they make, we can differentiate voluntary and involuntary

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muscles.

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Voluntary muscles move only when we want them to.

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And involuntary muscles move without us realising, like our heart or stomach, that are always

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a movement.