Pathophysiology Lab Review
Physiology Lab Review Questions for Final
7.2: Electrocardiogram (ECG)
1. The pacemaker region of the heart is the right atrium (SA node) ____________________________.
2. The conducting tissue of the heart located in the interventricular septum is the right and left bundle branches
3. Indicate the electrical events that produce each of these waves:
a. P wave __atrial depolarization________________________________________________________.
b. QRS wave __ventricular depolarization_________________________________________________.
c. T wave __ventricular repolarization____________________________________________________.
5. An abnormally fast rate of beat is called tachycardia; an abnormally slow rate is called bradycardia
6. An abnormally long P-R interval indicates a condition called first-degree AV block
8. Which ECG wave must occur before the ventricles can contract? QRS Complex
9. Which ECG wave must occur before the ventricles can relax? T wave
11. Describe the pathway of conduction from the atria to the ventricles and correlate this conduction with the ECG waves. The SA node is designated as the pacemaker of the heart. From the SA node, the electrical impulse spreads through interatrial tracts that spread the electrical impulse through the right and left atria and therefore cause atrial depolarization. As a result, a P-wave is observed. After the atria depolarize, the electrical impulse spreads through the internodal tracts and reach the atrioventricular node (AV node). The AV node has its own pacing rhythm that serves as a back up pacemaker in case the SA node fails to initiate an electrical impulse. Consequently, the AV node slows down the electrical impulse to allow the atria to project their blood into the ventricles. From the AV node, the impulse travels through the bundle of His, which bifurcate into the left and right bundle branches. From the branches, the impulse travels through the Purkinje fibers and allows the electrical impulse to end
7.2: Electrocardiogram (ECG)
1. The pacemaker region of the heart is the right atrium (SA node) ____________________________.
2. The conducting tissue of the heart located in the interventricular septum is the right and left bundle branches
3. Indicate the electrical events that produce each of these waves:
a. P wave __atrial depolarization________________________________________________________.
b. QRS wave __ventricular depolarization_________________________________________________.
c. T wave __ventricular repolarization____________________________________________________.
5. An abnormally fast rate of beat is called tachycardia; an abnormally slow rate is called bradycardia
6. An abnormally long P-R interval indicates a condition called first-degree AV block
8. Which ECG wave must occur before the ventricles can contract? QRS Complex
9. Which ECG wave must occur before the ventricles can relax? T wave
11. Describe the pathway of conduction from the atria to the ventricles and correlate this conduction with the ECG waves. The SA node is designated as the pacemaker of the heart. From the SA node, the electrical impulse spreads through interatrial tracts that spread the electrical impulse through the right and left atria and therefore cause atrial depolarization. As a result, a P-wave is observed. After the atria depolarize, the electrical impulse spreads through the internodal tracts and reach the atrioventricular node (AV node). The AV node has its own pacing rhythm that serves as a back up pacemaker in case the SA node fails to initiate an electrical impulse. Consequently, the AV node slows down the electrical impulse to allow the atria to project their blood into the ventricles. From the AV node, the impulse travels through the bundle of His, which bifurcate into the left and right bundle branches. From the branches, the impulse travels through the Purkinje fibers and allows the electrical impulse to end