Complete each sentence below to demonstrate your understanding of the initiation

Question

Complete each sentence below to demonstrate your understanding of the initiation and spread of action potentials through the heart. The depolarization of the normally generates the action potential SA node that leads to depolarization of all other cardiac muscle cells Thus, the discharge rate of this group of cells determines the P wave The action potential initiated in the SA node passes from cell to cell by way of gap junctions Depolarization first spreads through muscle cells of the with conduction interventricular septum rapid enough that both atria at essentially the same time This is signified as the on an ECG recording T wave Next, the depolarization slowly travels through the which is the link between atrial and ventricular depolarization bundle of His After leaving the AV node, the action potential enters a region of the muscular wall known as the heart rate Within this wall are conducting-system pathways called the and left bundle branches that separate at the bottom of the heart and enter the walls of both ventricles. Bundle of His fibers make contact with which divide into the right contract which are large-diameter conducting cells that rapidly distribute the action potential throughout much of the ventricles. ECG recording Finally, ventricular cells undergo repolarization, which is signified as the Purkinje fibers The resulting ventricular depolarization is signified as the on an QRS complex on an ECG recordin atria AV node Reset

Explanation / Answer

1. SA Node

2. Heart rate

3. Gapjunctions

4. Atria, contract

5. P wave

6. AV Node

7. Bundle of his

8. Interventricular septum

9. Purkinji fibers

10. QRS complex

11. T wave

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