Muscles
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Muscles PowerPoint PPT Presentation


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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

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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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