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quick question about sympathetic nervous system

Discussion in 'MCAT Study Question Q&A' started by auroraboy, May 13, 2008.

  1. auroraboy

    2+ Year Member

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    According to Princeton science workbook sympathetic nervous system does not innervate skeletal muscles..Is this really true?

    What I understood was that sympathetic nervous system is responsible for 'Flight, Fight, Fright'
    Would these not require skeletal muscles?

    On second thought, Muscle cells are always paired with ACh, never with norepinephrine ... does this mean sympathetic nervous system only controls cardiac/smooth muscles?

    Could someone please care to explain?
     
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  2. bioteach

    bioteach MSIV
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    The sympathic system is part of your autonomic nervous system. The ANS ennervates smooth muscle, cardiac muscle and glands. The somatic nervous system ennervates skeletal muscle. You may be thinking about the blood vessels that provide nutrients to the skeletal muscle. The sympathetic system is going affect the smooth muscle in the blood vessels and allow vessels to dilate thus providing more glucose/oxygen to the skeletal muscle. It doesn't not ennervate the skeletal muscle itself.
     
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  3. bioteach

    bioteach MSIV
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    Remember: skeletal muscle is voluntary (i.e. walking, running) in its action. Everything the ANS controls is involuntary (heartbeat, digestion) in action.
     
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  4. auroraboy

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    That makes sense...I was confusing myself with sympathetic/parasympathetic systems,

    Thanks!
     
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  5. eikenhein

    eikenhein Supreme Commander Anesthesiologist
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    Sympathetics and Parasympathetics don't innervate skeletal muscles.
     
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