Electrophysiology of the Heart Quiz

What is the state of cardiac cells at rest?

• Positively charged

• Negatively charged

• Neutral

• Depolarized

What happens during depolarization of a cardiac cell?

• Large amounts of Na rush into the cell

• Large amounts of K rush into the cell

• Large amounts of Na rush out of the cell

• Large amounts of K rush out of the cell

What is the purpose of the sodium-potassium pump during cell recovery?

• To shift Na and K back to their original position

• To maintain the cell in a depolarized state

• To initiate repolarization

• To stimulate atrial contraction

Which wave represents atrial depolarization?

• P wave

• QRS complex

• T wave

• U wave

What does the QRS complex represent?

• Atrial depolarization

• Ventricular depolarization

• Atrial repolarization

• Ventricular repolarization

What does the T wave represent?

• Atrial depolarization

• Ventricular depolarization

• Atrial repolarization

• Ventricular repolarization

What is the purpose of the U wave?

• To represent atrial repolarization

• To represent ventricular repolarization

• To indicate electrical silence

• To indicate late ventricular repolarization

What is the flat line between waves called?

• PR segment

• ST segment

• Baseline or isoelectric line

• QRS complex