1. Are any of the time intervals approximately constant?
2. With the exception of the R-R interval, which time interval shows the greatest difference between resting and post-exercise? Explain this observation.
3. If coronary arteries fill while the heart muscle is relaxed, what happens to the time course of coronary blood flow when heart rate is increased?
4. What happens to the amount of work done by the heart as heart rate increases? Would this explain why MOST heart attacks (MIs) take place during physical exertion?

 
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