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

a. 5, 4, 3, 2, 1

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

a. 1, 3, 2, 4

b. 4, 3, 2, 1

c. 3, 4, 1, 2

d. 2, 4, 1, 3

ANS: C