Scientists used an ECG trace to monitor the heart of a student at rest and during exercise. What is the explanation for the difference in the ECG traces?
During exercise the heart rate increases to transport more oxygen to muscles.
2 )
During exercise the heart rate increases to breathe in more oxygen.
3 )
During exercise the breathing rate increases to supply more oxygen to muscles.
4 )
During exercise the breathing rate increases to breathe in more oxygen.
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