18. The Heart

Choose the correct sequence of electrical current flow through the heart wall.

In the electrical conduction system of the heart, which structure normally serves as the pacemaker by initiating the heartbeat?

Which component of the heart's electrical conduction system is responsible for initiating the heartbeat?

In which situation should synchronized cardioversion be used?

Which of the following is not part of the intrinsic conduction system of the heart?

Which of the following is the correct sequence of components in the heart's electrical conduction system?

Which of the following is not part of the cardiac conduction system?

Which of the following receive(s) blood during ventricular systole?

Why are gap junctions a vital part of the intercellular connection of cardiac muscles?

Which of the following correctly lists the main components of the cardiac conduction system in the order that an electrical impulse travels through the heart?

Which of the following represents ventricular depolarization in the heart's electrical conduction system?

What is the priority intervention for a patient in ventricular fibrillation?

Why is the QRS complex larger than the P wave in an electrocardiogram (ECG)?

Which of the following is the correct sequential path of an action potential in the heart?