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Sympathetic nervous system activates major skeletal muscle?

  1. Jan 4, 2014 #1
    Is is true that "Sympathetic nervous system activates your heart and major skeletal
    muscles?

    Thank you for your help!
     
  2. jcsd
  3. Jan 4, 2014 #2
    Input from sympathetic nervous system can increase your heart rate (and probably action potential conductance too) yes. Heart has a base beating rate caused by autorhythmic cells in SA node, which is actually higher than your normal rest pulse. That's because parasympathetic input can decrease heart rate, and parasympathetic input is stronger than sympathetic at rest.

    Sympathetic nervous system doesn't directly affect skeletal muscles, but it does dilate blood vessels near skeletal muscles, for example.
     
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