Answer:
Heart rate is controlled by the two branches of the autonomic (involuntary) nervous system. The sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS). The sympathetic nervous system (SNS) releases the hormones (catecholamines - epinephrine and norepinephrine) to accelerate the heart rate.
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Answer:
Military Entrance Processing Stations
Explanation:
Answer:
Explanation: The heart pumps blood through the network of arteries and veins called the cardiovascular system.
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