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

The blood flows through the valves in the following direction: tricuspid,