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liberstina [14]
2 years ago
9

As your muscles contract during activity, more blood is returned to the heart. which variable would be affected and what would b

e the outcome of this action?
Biology
1 answer:
timama [110]2 years ago
6 0
Heart rate. <span>From this site, the two channels of the autonomic nervous system originate the sympathetic and parasympathetic components. The sympathetic components increase heart rate by releasing the neural hormone catecholamines - epinephrine and norepinephrine. These hormones are cardio accelerators. Acceleration of the heart rate is called tachycardia.</span>
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