body system

• Muscular system


  Organs that work together to allow movement
• Parts of the body with muscles

  • Legs
  • Arms
  • Fingers
  • Stomach
• Muscles

  • Some are hard, some are soft
  • Covered by bones
• Muscles allow us to move, bones cannot move without muscles
• The muscular system is made up of all the muscles in the body
• Muscle

  Consists of fibers or muscle cells held together
• Muscle types

  • Large
  • Long
  • Small
  • Short
• Muscles make up 40% of total body weight
• Tendon

  Tough cord that connects muscle to bone
• Tendons are made of tough protein fibers called collagen
• Muscle contracts

  Tendon pulls bone, causing it to move
• The face has 50 muscles, 17 are used to smile, 46 to frown
• Muscles


  • Can contract and become short
  • Can relax and return to original length
  • React to signals from the brain
• Muscle types

  • Cardiac (involuntary, in heart)
  • Smooth (involuntary, in digestive system)
  • Skeletal (voluntary, move bones)
• Skeletal muscles make up large part of arms, legs, chest, abdomen
• Bones, muscles, joints, ligaments and tendons work together