Body movement occurs at movable joints.Two muscles are used in each movement.
These muscles are called antagonistics because they perform opposite actions. When one muscle contracts, the other relaxes.
For example, arms bend at the elbow with a flexing movement. They straighten with an extending movement.
These muscles are called antagonistics because they perform opposite actions. When one muscle contracts, the other relaxes.
For example, arms bend at the elbow with a flexing movement. They straighten with an extending movement.
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