Podcast
Questions and Answers
What is the purpose of an ECG recording?
What is the purpose of an ECG recording?
Recording the electrical activity that initiates each heartbeat
What does the P wave in a normal ECG represent?
What does the P wave in a normal ECG represent?
Electrical potential generated from depolarization of the atria before their contraction
Which part of the heart generates the QRS complex in an ECG?
Which part of the heart generates the QRS complex in an ECG?
Ventricles before their contraction
What causes the T wave in a normal ECG?
What causes the T wave in a normal ECG?
Signup and view all the answers
How is the P wave related to atrial contraction?
How is the P wave related to atrial contraction?
Signup and view all the answers
When does ventricular contraction follow the QRS complex?
When does ventricular contraction follow the QRS complex?
Signup and view all the answers
What is the normal value of the P-Q or P-R interval on the electrocardiogram?
What is the normal value of the P-Q or P-R interval on the electrocardiogram?
Signup and view all the answers
What does the Q-T interval represent on the electrocardiogram?
What does the Q-T interval represent on the electrocardiogram?
Signup and view all the answers
Where does a cardiac action potential arise?
Where does a cardiac action potential arise?
Signup and view all the answers
What causes the 0.1-sec delay at the AV node?
What causes the 0.1-sec delay at the AV node?
Signup and view all the answers
What does the appearance of the P wave in the ECG signify?
What does the appearance of the P wave in the ECG signify?
Signup and view all the answers
Why is the atrial contraction delayed at the AV node?
Why is the atrial contraction delayed at the AV node?
Signup and view all the answers
When does the depolarization progress through the bundle branches, Purkinje fibers, and the entire ventricular myocardium?
When does the depolarization progress through the bundle branches, Purkinje fibers, and the entire ventricular myocardium?
Signup and view all the answers
What happens during ventricular systole?
What happens during ventricular systole?
Signup and view all the answers
Why is atrial repolarization not usually evident in an ECG?
Why is atrial repolarization not usually evident in an ECG?
Signup and view all the answers
When does the repolarization of ventricular contractile fibers begin?
When does the repolarization of ventricular contractile fibers begin?
Signup and view all the answers
When does ventricular repolarization complete and the ventricular contractile fibers relax?
When does ventricular repolarization complete and the ventricular contractile fibers relax?
Signup and view all the answers
What happens as contraction proceeds from the apex toward the base of the heart during ventricular systole?
What happens as contraction proceeds from the apex toward the base of the heart during ventricular systole?
Signup and view all the answers
