Sympathetic nervous system activates major skeletal muscle?

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The sympathetic nervous system indeed activates the heart and influences skeletal muscle indirectly. It increases heart rate and action potential conductance, with the heart's base rate set by autorhythmic cells in the SA node, which is typically higher than the resting pulse due to stronger parasympathetic input at rest. While the sympathetic nervous system does not directly affect skeletal muscles, it plays a role in dilating blood vessels near these muscles, enhancing blood flow during activation.
jennifer1585
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Is is true that "Sympathetic nervous system activates your heart and major skeletal
muscles?

Thank you for your help!
 
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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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