10 Questions
What is the term used to describe the phenomenon shown in Figure 11-2A?
Depolarization wave
Which electrode in Figure 11-2C is in an area of positivity during halfway repolarization of the muscle fiber?
Left electrode
What occurs to the recording to the right in Figure 11-2D when the muscle fiber has completely repolarized?
There is no potential difference recorded between the electrodes
What is the duration of a monophasic action potential of ventricular muscle typically recorded from a microelectrode?
0.25 to 0.35 seconds
What causes the upsweep of the action potential in the top part of Figure 11-3?
Depolarization
What is the normal sequence of waves in a standard ECG?
P wave, QRS complex, T wave
What is the primary cause of the P wave in an ECG?
Atrial depolarization
What is the time duration between depolarization and repolarization in ventricular muscle?
0.25 to 0.35 second
What is the term for the process by which the ventricles recover from depolarization?
Repolarization
What is the term for the wave caused by potentials generated as the ventricles recover from the state of depolarization?
T wave
Learn about the composition of a normal ECG, including the P wave, QRS complex, and T wave. Understand how these waves are generated by the depolarization and contraction of the atria and ventricles.
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