Cardiac Conduction, ECG and Cardiac Cycle Review

Front

What is the primary function of the sinoatrial node?

Back

The sinoatrial node is responsible for generating and maintaining the sinus rhythm, which is the normal rhythm of the heart.

Front

Where is the Atrioventricular (AV) node located?

Back

The AV node is located at the junction of the atria and ventricles, specifically at point C in the cardiac conduction system.

Front

What does the term 'diastole' refer to in the cardiac cycle?

Back

Diastole refers to the phase when a chamber of the heart is relaxing.

Front

What does the threshold level in cardiac action potentials signify?

Back

The threshold level is the point at which depolarization reaches a level that triggers the spontaneous generation of an action potential.

Front

What event occurs during atrial systole?

Back

During atrial systole, the atria contract to push blood into the ventricles.

Front

What is the role of Purkinje fibers in the cardiac conduction system?

Back

Purkinje fibers distribute the electrical impulse throughout the ventricles, leading to coordinated contraction.

Front

What is represented by the P wave in an ECG?

Back

The P wave represents atrial depolarization, which occurs just before atrial contraction.

Front

What does the QRS complex indicate in an ECG?

Back

The QRS complex indicates ventricular depolarization, which precedes ventricular contraction.

Front

What is the significance of the T wave in an ECG?

Back

The T wave represents ventricular repolarization, which occurs as the ventricles prepare for the next cycle.

Front

What happens during ventricular systole?

Back

During ventricular systole, the ventricles contract to pump blood out of the heart.