Questions: I. The pacemaker of the heart is the The conducting tissue of the hea

Question

Questions: I. The pacemaker of the heart is the The conducting tissue of the heart located in the interventricular septum is the 2. 3. Indicate the electrical events that occur during each of these waves/deflections: a. P wave b. QRS c. T wave 4. The electrical synapses in myocardial cells are called 5. An abnormally fast heart rate is called 6. An abnormally slow heat rate is called 7. An abnormally long P-R interval indicates a condition called 8. Leads I, II, and II are collectively called the 9. Which ECG wave/deflection occurs during ventricular contraction? leads 10. Which ECG wave/deflection must occur before the ventricles can relax? 11. Describe the pathway of conduction from the atria to the ventricles.

Explanation / Answer

1. Sinoatrial node

2. Bundle of his

3. a. depolarization of the atria

b. depolarization of the ventricles

c. repolarization of the ventricles at the beginning of the diastole.

4. gap junctions

5. tachycardia

6. bradycardia

7. AV blockage

8. Standard limb lead

9. QRS wave

10. T wave

11. Depolarization starts at the SA node( also known as the pacemaker of the heart) and travels to the AV node. once the signal reaches the AV node, it moves across the right and left ventricles through the bundle of His and the left/right bundle branches.The signals then reach the purkinje fibres at the bottom of the ventricles.

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