Biology, 01.10.2019 11:20, tornadobrooks11

Upon vigorous exercise, your heart rate increases to 200 beats per minute to supply sufficient oxygen to muscles. which is responsible for this regulation of the heart rate? a. semilunar valves
b. sinoatrial node
c. aorta

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Upon vigorous exercise, your heart rate increases to 200 beats per minute to supply sufficient oxyge...