The Muscular System

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   Antagonistic      cannot      cardiac      leg      move      relaxes      triceps      voluntary   
The heart is made of a unique muscle type known as and it never tires.
The body also has many other muscles, some that are attached to the skeleton and help the body , some involuntary muscles that control our internal organs and be controlled.
pairs of muscles create movement when one contracts and the other .
Examples of an antagonistic pair working together are the quadriceps and hamstrings in the , or the biceps and in the arm