Cardiac Conduction System Quiz

What initiates muscle contraction in the heart?

• Constant positive charge

• Negative to positive charge conversion

• Positive to negative charge conversion

• Constant negative charge

What does depolarization in the heart muscle cells cause?

• Decreased heart rate

• No change

• Contraction

• Relaxation

What is the primary function of the sinoatrial node?

• To pump blood through the heart

• To act as the heart's pacemaker

• To conduct electrical signals to the brain

• To generate a negative charge

What causes the atria to contract?

• Repolarization of the atria

• Depolarization of the AV node

• Repolarization of the ventricles

• Depolarization of the SA node

What does a positive deflection on an ECG indicate?

• No change in electrical activity

• Positive charge moving away from the lead

• Negative charge moving towards the lead

• Positive charge moving towards the lead

What does the flat line on an ECG represent?

• The heart is at rest

• Atrial depolarization

• Ventricular depolarization

• No electrical activity

What does the atrioventricular node do?

• It immediately sends the signal to the ventricles

• It pauses the electrical signal for about 0.2 seconds

• It decreases the heart rate

• It stops the heart's electrical activity

How does the left side of the heart affect the ECG reading?

• It has no effect

• It balances the electrical activity with the right side

• It overwhelms the right side due to thicker muscle

• It causes a smaller spike due to thinner muscle

What is the effect of the heart muscle depolarizing?

• The heart muscle relaxes

• The heart muscle contracts

• The heart rate decreases

• The heart stops

What is represented by the P wave on an ECG?

• Ventricular repolarization

• Atrial repolarization

• Atrial depolarization

• Ventricular depolarization