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When joe prepares to spar an opponent in tae kwon do, his heart rate and respiration rate increase. these are indicators that his ________ nervous system has been activated?
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When joe prepares to spar an opponent in tae kwon do, his heart rate and respiration rate increase. these are indicators that his ________ nervous system has been activated?

User Charlene
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It means that his autonomic(sympathetic) nervous system is activated. 
User Matej Tymes
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