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Author Question: The QRS complex represents which of the following? a. Atrial depolariza-tion c. Ventricular ... (Read 50 times)

@Brianna17

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on: Jul 16, 2018
The QRS complex represents which of the following?
 
  a. Atrial depolariza-tion c. Ventricular repolar-ization
  b. Ventricular depo-larization d. Threshold potential

Question 2

On an electrocardiogram, the time between atrial and ventricular contraction is known as the:
 
  a. PR segment c. QRS interval
  b. ST segment d. QT interval


TheNamesImani

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Reply #1 on: Jul 16, 2018
Answer to Question 1

ANS: B
Ventricular depolarization is represented on the electrocardiogram as the QRS complex. The P wave represents atrial depolarization. The T wave represents ventricular repolarization. Threshold potential is the critical level of electrical excitation reached by any cell, causing an action poten-tial to occur.

Answer to Question 2

ANS: A
The PR segment represents the time delay that occurs within the atrioventricular node and therefore represents the time between atrial and ventricular contractions. The ST segment occurs during ventricular depolarization, the QRS interval represents ventricular polarization, and the QT interval represents the time required for ventricular depolarization and repolarization to oc-cur.


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