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Muscles. Chapter 18-2. What is a muscle?. An organ that can relax and contract to allow movement Attach to bones by tendons More than 600 in our bodies Smallest in our ears ( stapedius ) Largest in our thighs ( sartorious ). How do muscles work?. Works with your skeletal system.

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muscles

Muscles

Chapter 18-2

what is a muscle
What is a muscle?
  • An organ that can relax and contract to allow movement
  • Attach to bones by tendons
  • More than 600 in our bodies
    • Smallest in our ears (stapedius)
    • Largest in our thighs (sartorious)
how do muscles work
How do muscles work?
  • Works with your skeletal system.
  • Work by contracting or shortening.
  • Work in pairs- one muscle contracts, the other relaxes
  • Get the energy needed for movement from glucose.
voluntary vs involuntary
Voluntary vs. Involuntary
  • Voluntary muscles: you can control
    • Ex: arms, legs
  • Involuntary muscles: you do not consciously control
    • Ex: heart, lungs, digestive tract
types of muscle
Types of Muscle
  • Skeletal- voluntary; striated; attached to bones to help us move.
  • Smooth- involuntary; non-striated;

make up internal organs

  • Cardiac- involuntary; striated; found only in the heart to help it beat.
taking care of your muscles
Taking care of your muscles
  • Exercise-helps cells grow in size
  • Warm up/stretch-increases blood flow to help muscle be more flexible
  • Well balanced diet (especially protein)
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