Chapter 4- The Electrical System Review Questions

Question 1

The sinoatrial node is located in the:

a. right atrium
b. right ventricle
c. purkinje fiber tract
d. atrioventricular septum

Answer 1

a. right atrium

Question 2

The AV node is located in the:

a. right atrium
b. left ventricle
c. purkinje fiber tract
d. atrioventricular support

Answer 2

a. right atrium

Question 3

The intrinsic firing rate of the AV junction is ___ BPM.

a. 15-20
b. 25-35
c. 35-45
d. 40-60

Answer 3

d. 40-60

Question 4

The intrinsic firing rate of the SA node is ___.

a. 20-60
b. 40-80
c. 60-100
d. 80-100

Answer 4

c. 60-100

Question 5

The electrocardiogram is used to:

a. determine pulse rate
b. detect valvular dysfunction
c. evaluate electrical activity in the heart
d. determine whether the heart is breathing

Answer 5

c. evaluate electrical activity in the heart.

Question 6

The normal conduction pattern of the heart follows the sequence:

1. SA node
2. purkinje fibers
3. bundle of his
4. AV node
5. bundle branches
6. internodal pathways
   a. 1,2,3,5,6,4
   b. 1,6,4,3,5,2
   c. 1 ,6,4,2,3,5
   d. 6,1,5,4,3,2

Answer 6

b. 1,6,4,3,5,2

Question 7

The intrinsic firing rate of the purkinje network is ___ BPM.

a. 60-80
b. 40-60
c. 20-40
d. 10-20

Answer 7

c. 20-40

Question 8

The SA node receives its blood supply primarily from the:

a. left coronary artery
b. great cardiac vein
c. right coronary artery
d. aorta

Answer 8

c. right coronary artery

Question 9

____ internodal tracts or pathways receive the electrical impulse as it leaves the SA node. These tracts distribute the electrical impulse throughout the atria and transmit the impulse from the SA node to the AV node.

a. two
b. three
c. four
d. five

Answer 9

b. three

Question 10

What is the specialized group of cardiac fibers conducting electrical activity from the SA node to the left atrium?

a. purkinje network
b. bundle of his
c. bachman’s bundle
d. intercalated disks

Answer 10

c. bachman’s bundle

Question 11

The interventricular septum is the wall between the:

a. right and left atrium
b. right and left ventricle
c. inferior and superior chambers
d. inferior and superior vena cava

Answer 11

b. right and left ventricle

Question 12

Purkinje’s network of fibers can be identified only with the aid of a microscope.

a. true
b. false

Answer 12

a. true

Question 13

The primary functions of the myocardial working cells include:

a. automaticity
b. regeneration
c. contaction and relaxation
d. impulse propagation

Answer 13

b. regeneration