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Questions and Answers
Which of the following is true about the T wave in a normal ECG?
Which of the following is true about the T wave in a normal ECG?
- It is composed of three separate waves
- It is known as a repolarization wave (correct)
- It is caused by electrical potentials generated during atrial contraction
- It is a depolarization wave
What is the QRS complex in a normal ECG caused by?
What is the QRS complex in a normal ECG caused by?
- Potentials generated when the atria depolarize before atrial contraction begins
- Potentials generated as the ventricles recover from the state of depolarization
- Potentials generated when the ventricles depolarize before contraction (correct)
- Potentials generated when the ventricles repolarize after contraction
What happens to the potential difference between two electrodes during repolarization of a cardiac muscle fiber?
What happens to the potential difference between two electrodes during repolarization of a cardiac muscle fiber?
- It becomes more positive on the inside and more negative on the outside
- It becomes more negative on the inside and more positive on the outside
- It returns to zero (correct)
- It remains the same as during depolarization
