Electrocardiogram Lab (ECG) This Exercise is done using the Ph.I.L.S CD Do the lab #22. ECG...

Electrocardiogram Lab (ECG)

This Exercise is done using the Ph.I.L.S CD

Do the lab #22. ECG and Exercise.Or just click here to there

Look at your data and compare each time interval for the resting and post-exercise state.

Are any of the time intervals approximately constant?
With the exception of the R-R interval, which time interval shows the greatest difference between resting and post-exercise? Explain this observation.
If the coronary arteries fill when the heart muscle is relaxed, what happens to the time course of coronary blood flow when the heart rate is increased?
What happens to the amount of work done by the heart as the heart rate is increased?

Would this explain why most heart attacks (periods when there is insufficient blood flow to parts of the heart) take place during physical exertion?

Expert Solution

Answer 1:)

RR interval is irregular while the P-R interval shows the constant time interval. PR interval is also called the PQ interval.

Answer 2:)

The QT time interval shows the biggest difference between resting and post-exercise. During resting, the QT time interval is longer than post-exercise.

Answer 3:)

As the heart rate increased, the coronary blood flow is decreased. The curve between both is a typical dose-response curve.

Answer 4:)

The amount of work done by heart rate is increased because the heart needs to pump more blood by increasing its rate. More volume of blood causes more work done by the heart.

Answer 5:)

The main reason is pressure on the walls of the heart by increased pumping. The heart increases its pumping to maintain the cardiac output during exercise, for that the heart filled its ventricle with blood more and that causes extra pressure on walls. The increased pressure on the walls of the heart causes it to fail. The other reason is hypertrophy in which the heart develops its muscles thicker. The hypertrophy of heart also needs more oxygen and nutrient, which if get depleted the heart muscles become weaker. This also causes the impaired function of the heart and then its failure.

Sydney Mullin answered 1 year ago

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