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OpenStudy (anonymous):
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? Semilunar valves Sinoatrial node Aorta
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OpenStudy (anonymous):
@roha
OpenStudy (anonymous):
yeah?
OpenStudy (anonymous):
Do you know what this is ?
OpenStudy (anonymous):
let me see
OpenStudy (anonymous):
Ok , thanks(:
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OpenStudy (anonymous):
Sweet , thank you !
OpenStudy (anonymous):
your welcome!! :)
OpenStudy (abhisar):
How ?
OpenStudy (anonymous):
whats the answer??
OpenStudy (anonymous):
whats the answer ??
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