eqr question

Topics: Heart, Heart rate, QRS complex Pages: 3 (284 words) Published: October 19, 2014
Laboratory Report 4
Experiment HN-2: The Electrocardiogram and Heart Sounds

Exercise 1: The ECG in a Resting Subject

Objective: To measure the ECG in a resting individual.


Questions and answers:
1. Is the amplitude of each wave (P, QRS, T) always the same in different cardiac cycles?

2. Which wave has the largest amplitude?

3. What is the average resting heart rate of the subject?

Exercise 2: ECG Recording from Other Subjects

Objective: To measure heart rate from all students.


Questions and answers:

1. Do the P waves of different subjects have the same amplitude? The QRS complexes? The T waves? Why?

2. For each subject, determine the wave with the largest amplitude. Is this result the same for all individuals?

3. Is the heart rate the same for each individual?

4. What is the range of resting heart rates within the class?

5. Are there any obvious correlations between resting heart rate and gender, apparent fitness, or diet of your subjects?

Exercise 3: The ECG and Heart Sounds

Objective: To study the phasing of heart sounds to the ECG.


Question and answers:
1. Why does the lub sound occur around the peak of the R wave? Because of hearts ventricle contraction.

2. Is the time delay between the R wave and the lub sound always the same? Explain why the time delay is or is not the same. Not the same because left ventricle contract before right ventricle.

3. Why does the dub sound occur around the peak of the T wave?

4. Is the time delay between the T wave and the dub sound always the same? Explain why the time delay is or is not the same.
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