• Skeletal muscles are attached to the skeleton and cause bones to move when they contract.
  • A skeletal muscle contains bundles of muscle fibers inside a “coat” of connective tissue.
  • To move bones in opposite directions, pairs of muscles must work in opposition.
  • In exercises such as running, the cardiac muscle contracts faster and the heart pumps more blood.
  • Continued exercise is necessary to maintain bigger, stronger muscles.
  • If you don’t use a muscle, it will get smaller and weaker—so use it or lose it.
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