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Muscles work in pairs
Muscles expand  when we do body building.
Muscles work when we jump,run or walk

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whan we do something like siting or something so our muscles work.

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Muscles move body parts by contracting and then relaxing. Muscles can pull bones, but they can't push them back to the original position. So they work in pairs of flexors and extensors. The flexor contracts to bend a limb at a joint

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Muscle Tightness Explained:  Why do my muscles feel tight?

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when we move are arm forward the triceps expand and the biceps well relax
muscles beacome longer and longer when we grow.

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Mannan Hashmi
Muscles help us to walk, stand, sit and run. We have to exercise and drink milk so our bones can get stronger

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Muscles move by walking eating playin sitting

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1ans:muscles they like move body parts by contracting and relaxing
2ans:they can though they can move or relax back.

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Muscles move by  sitting walking playing eating  and other etc things that muscles move by

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Muscles can work with bones and with bone we can to lots of thing we can run because muscles help us to move so its important that we have muscles

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Abdul wasay
Muscles are use in different works like eating, siting and running and muscles can be stretch like reason yes muscles can be expand when we full open our arm

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1.ans:muscles work by

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Muscles help us run, stand, move etc.
Yes mucles do expande. A baby has more bones then an adult because
As people grow up there muscles start expanding and become bigger bones.

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Muscles   move   body  parts  by   contracting   and   expanding

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Muscles   move   body  parts  by   contracting   and   expanding

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for   example   the muscles    in  your arm   when   you   stretch   your   arm  one  muscle   will   expand   one  will   contract    by Hamza

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Muscles move body parts by contracting and then relaxing. Muscles can pull bones, but they can't push them back to the original position. So they work in pairs of flexors

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Muscles work by sitting eating moving playing and etc. also they can expand. because they are stretchy just like a rubber band.

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Moving and growing
Answer : muscles work when we move they  and also they expand because they are like rubber for e.g  I am stretching
My hand and  if I want to do it back like normal it was so I can because  a rubber when we  stretch a rubber it comes back in it's normal size so this is how are muscles work .

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How do muscles work?
Muscles are joined to bones by tendons,and help them to move. Muscles work in pairs to move
a joint. When a muscle is contract, the other one has relaxes. Muscles can only pull but cannot push.