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Understanding the Components of a Normal ECG

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Understanding the Components of a Normal ECG

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Questions and Answers

What is the term used to describe the phenomenon shown in Figure 11-2A?

Depolarization wave (correct)

Repolarization period

Hyperpolarization event

Equilibrium phase

Which electrode in Figure 11-2C is in an area of positivity during halfway repolarization of the muscle fiber?

Left electrode (correct)

Both electrodes

Right electrode

Neither electrode

What occurs to the recording to the right in Figure 11-2D when the muscle fiber has completely repolarized?

It becomes increasingly negative

Both electrodes experience a change in polarity

There is no potential difference recorded between the electrodes (correct)

It shows a maximum positive value

What is the duration of a monophasic action potential of ventricular muscle typically recorded from a microelectrode?

0.25 to 0.35 seconds Signup and view all the answers

What causes the upsweep of the action potential in the top part of Figure 11-3?

Depolarization Signup and view all the answers

What is the normal sequence of waves in a standard ECG?

P wave, QRS complex, T wave Signup and view all the answers

What is the primary cause of the P wave in an ECG?

Atrial depolarization Signup and view all the answers

What is the time duration between depolarization and repolarization in ventricular muscle?

0.25 to 0.35 second Signup and view all the answers

What is the term for the process by which the ventricles recover from depolarization?

Repolarization Signup and view all the answers

What is the term for the wave caused by potentials generated as the ventricles recover from the state of depolarization?

T wave Signup and view all the answers