Cardiac System

What does the QRS complex on an electrocardiogram (ECG) represent?

• Atrial contraction

• Ventricular depolarization

• Ventricular repolarization

• Atrial repolarization

What does the T wave on an electrocardiogram (ECG) represent?

• Atrial contraction

• Ventricular depolarization

• Ventricular repolarization

• Atrial repolarization

What is the purpose of the delay in the atrioventricular node?

• To ensure the atria have ejected all the blood into the ventricles before the ventricles contract

• To initiate all heartbeats

• To conduct electrical impulses toward the apex of the heart

• To spread electrical impulses throughout both atria

What is the purpose of the Bundle of His?

• To initiate all heartbeats

• To delay the passage of electrical impulses to the ventricles

• To conduct electrical impulses toward the apex of the heart

• To spread electrical impulses throughout both atria

What is the purpose of recording an electrocardiogram (ECG)?

• To measure blood pressure

• To visualize the heart's structure

• To monitor the electrical activities of the heart

• To assess heart valve function

What does the P wave on an electrocardiogram (ECG) represent?

• Atrial contraction

• Ventricular depolarization

• Ventricular repolarization

• Atrial repolarization

The P-wave correlates with which event?

• atrial depolarization

• ventricle depolarization

• ventricle repolarization

• atrial repolarization

What is going on in the heart during the R-wave or QRS complex

• SA node triggers depolarization in atria

• AV node triggers depolarization in ventricles, the main pumping action

• Delay caused by the SA node

• Repolarization of the ventricles

What is going on in the heart during the T-wave

• SA node triggers depolarization in atria

• AV node triggers depolarization in ventricle, the main pumpung action

• Delay caused by the SA node

• Repolarization of the ventricles

Tags

NGSS.HS-PS2-5

The pacemaker of the heart is the

• AV node

• SA node

• Bundle of His

• Purkyne fibres

Tags

NGSS.HS-LS1-3