1. A nurse is teaching staff about the conduction of the heart. In which

order

will the nurse present the conduction cycle, starting with the first

structure?

1. Bundle of His

2. Purkinje network

3. Intraatrial pathways

4. Sinoatrial (SA) node

5. Atrioventricular (AV) node

b. 4, 3, 5, 1, 2

c. 4, 5, 3, 1, 2

d. 5, 3, 4, 2, 1

ANS: B

The conduction system originates with the SA node, the “pacemaker” of

the heart. The electrical impulses are transmitted through the atria along

intraatrial pathways to the AV node. It assists atrial emptying by delaying

the impulse before transmitting it through the Bundle of His and the

ventricular Purkinje network.

2. A nurse is teaching the patient with mitral valve problems about the

valves in the heart. Starting on the right side of the heart, describe the

sequence of the blood flow through these valves.

1. Mitral

2. Aortic

3. Tricuspid 4. Pulmonic