Heart Physiology

Which part of the intrinsic conduction system is known as the "pacemaker" of the heart?

• atrioventricular (AV) node

• bundles of His

• Purkinje fibers

• sinoatrial (SA) node

Which part of the intrinsic conduction system connects the atria to the ventricles, and when damaged can cause various degrees of heart block?

• atrioventricular (AV) node

• bundles of His

• Purkinje fibers

• sinoatrial (SA) node

How is the cardiac cycle recorded?

• electrocardiogram (ECG or EKG)

• electroencephalogram (EEG)

• MRI image

• myogram

Which of the following is the correct order of the intrinsic conduction system?

• AV NODE - SA NODE - PURKINJE FIBERS - BUNDLES OF HIS

• SA NODE - AV NODE - PURKINJE FIBERS - BUNDLES OF HIS

• SA NODE - AV NODE - BUNDLES OF HIS - PURKINJE FIBERS

• AV NODE - SA NODE - BUNDLES OF HIS - PURKINJE FIBERS

Which of the following correlate with the sounds of the cardiac cycle heard with a stethoscope?

• atrial contraction

• the opening of valves

• the closing of valves

• electrical impulse conduction

Which of the following describes the P wave?

• atrial contraction

• ventricular contraction

• ventricular repolarization

• none of these

Which of the following describes the T wave?

• atrial contraction

• ventricular contraction

• ventricular repolarization

• none of these

Which of the following describes the QRS wave?

• atrial contraction

• ventricular contraction

• ventricular repolarization

• none of these

Where in the heart could I find the SA Node?

• Right Atrium
• Left Atrium
• Right Ventricle
• Left Ventricle

The emptying of the atria is controlled by the:

• SA node
• AV node
• Purkinje fibres
• Bundle of His