Arrhythmia (a) Quiz

In which phase of the action potential do Nonpacemaker and Pacemaker cells exhibit slow, continuous depolarization during rest?

Phase 0

Phase 2

Phase 3

Phase 4 (correct)

What does the P wave in the electrocardiogram reflect?

Ventricular repolarization

Ventricular depolarization

Atrial depolarization (correct)

Atrial repolarization

Which interval in the electrocardiogram represents the relationship between phases of the action potential?

PR Interval (correct)

ST Segment

QT Interval

QRS Complex

What is the major site of action of Anti-arrhythmic Drugs classified under Class I?

Inhibition of Fast depolarization Signup and view all the answers

What is the primary effect of Class III anti-arrhythmic drugs?

Prolong repolarization Signup and view all the answers

What is the mechanism of action of Class IV anti-arrhythmic drugs?

Inhibition of Plateau phase Signup and view all the answers

What does the QT Interval in the electrocardiogram represent?

Duration of ventricular action potential formation Signup and view all the answers

What is the process of initiation of reentry in the context of cardiac arrhythmias?

Two pathways for impulse conduction Signup and view all the answers

What is the result of disturbances in heart rhythm that leads to longer refractory period in pathway B?

Atrial arrhythmia Signup and view all the answers

What is the main risk factor associated with atrial dysfunction and mechanistic changes in the context of arrhythmia?

Oxidative stress Signup and view all the answers

What is the primary effect of Class II anti-arrhythmic drugs?

Sympatholytic action Signup and view all the answers

What is the effect of Phase 2 of the action potential?

Inhibition of Plateau phase Signup and view all the answers

What is the phase of the cardiac action potential that corresponds to the ST segment of the ECG?

Phase 2 Plateau phase Signup and view all the answers

Which phase of the SA node action potential causes the atrial muscles to contract?

Upstroke Phase 0 Signup and view all the answers

What is the phase sustained by inward movement of Ca+ and outward movement of K+?

Phase 0 Rapid depolarization Signup and view all the answers

Which phase corresponds to the T wave on the ECG?

Repolarization Phase 3 Signup and view all the answers

What initiates the sequence of pacemakers action potential in the heart?

SA node (physiological pacemaker) Signup and view all the answers

Which phase corresponds to the R and S waves on the ECG?

Phase 0 Rapid depolarization Signup and view all the answers

During which phase does the SA node generate an electrical impulse to start the action potential sequence?

Resting Phase 4 Signup and view all the answers

Which phase allows K+ to move out of the cell for repolarization?

Phase 2 Plateau phase Signup and view all the answers

What is the phase of the action potentials of the SA/AV Node?

Upstroke Phase 0 Signup and view all the answers

Which phase corresponds to the decline of potential at the end of phase 3 in pacemaker cells, such as the sinus node?

Repolarization Phase 3 Signup and view all the answers

During which phase does the sustained inward movement of Ca+ and outward movement of K+ occur?

Phase 0 Rapid depolarization Signup and view all the answers

Which phase of the SA node action potential causes the initial rapid repolarization?

Early repolarization Phase 1 Signup and view all the answers

Arrhythmia (a) Quiz

Questions and Answers

In which phase of the action potential do Nonpacemaker and Pacemaker cells exhibit slow, continuous depolarization during rest?

What does the P wave in the electrocardiogram reflect?

Which interval in the electrocardiogram represents the relationship between phases of the action potential?

What is the major site of action of Anti-arrhythmic Drugs classified under Class I?

What is the primary effect of Class III anti-arrhythmic drugs?

What is the mechanism of action of Class IV anti-arrhythmic drugs?

What does the QT Interval in the electrocardiogram represent?

What is the process of initiation of reentry in the context of cardiac arrhythmias?

What is the result of disturbances in heart rhythm that leads to longer refractory period in pathway B?

What is the main risk factor associated with atrial dysfunction and mechanistic changes in the context of arrhythmia?

What is the primary effect of Class II anti-arrhythmic drugs?

What is the effect of Phase 2 of the action potential?

What is the phase of the cardiac action potential that corresponds to the ST segment of the ECG?

Which phase of the SA node action potential causes the atrial muscles to contract?

What is the phase sustained by inward movement of Ca+ and outward movement of K+?

Which phase corresponds to the T wave on the ECG?

What initiates the sequence of pacemakers action potential in the heart?

Which phase corresponds to the R and S waves on the ECG?

During which phase does the SA node generate an electrical impulse to start the action potential sequence?

Which phase allows K+ to move out of the cell for repolarization?

What is the phase of the action potentials of the SA/AV Node?

Which phase corresponds to the decline of potential at the end of phase 3 in pacemaker cells, such as the sinus node?

During which phase does the sustained inward movement of Ca+ and outward movement of K+ occur?

Which phase of the SA node action potential causes the initial rapid repolarization?

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