Deck 47: Electrocardiography: Biopac Exercise

Question 1

Which components of the ECG lie entirely along the isoelectric line?

A) The intervals and segments
B) The segments
C) The waves and intervals
D) The waves
E) The intervals

Answer 1

B

Question 2

Functionally, how is cardiac muscle tissue controlled, compared to that of skeletal muscle tissue?

A) Both cardiac and skeletal muscle tissue are controlled by somatic motor neurons.
B) Cardiac muscle tissue is controlled by pacemaker cells within the heart, while skeletal muscle tissue is regulated by somatic motor neurons.
C) Cardiac and skeletal muscle tissue are controlled by both somatic motor neurons and by pacemaker cells within the respective tissues.
D) Both cardiac and skeletal muscle tissue are controlled by pacemaker cells within the respective tissues.
E) Cardiac muscle tissue is controlled by somatic motor neurons, while skeletal muscle tissue is controlled by pacemaker cells within the tissue.

Answer 2

B

Question 3

Which of the following is true of the intervals of the ECG?

A) They lie entirely along the isoelectric line.
B) They all contain at least 2 segments.
C) They all contain at least 1 wave and 1 segment.
D) They all contain the QRS complex.
E) They all contain the P wave.

Answer 3

C

Question 4

During the cardiac cycle, the left atrium and ventricle contract simultaneously, and then the right atrium and ventricle contract at the same time.

Question 5

During the cardiac cycle, which mechanical event immediately follows atrial repolarization?

A) Atrial systole
B) Ventricular diastole
C) Ventricular systole
D) Atrial diastole
E) Diastole of all four heart chambers

Question 6

The largest deflection from the isoelectric line in the ECG is found in the

A) P wave.
B) T wave.
C) T-P segment.
D) QRS complex.
E) P-R interval.

Question 7

Which structure of the cardiac conduction system is considered the final component of the system?

A) SA node
B) AV bundle
C) Purkinje fibers
D) Left and right bundle branches
E) AV node

Question 8

Typically, the heart rate increases during inspiration, and decreases during expiration.

Question 9

Which of the components of the cardiac conduction system briefly delays the signal from the pacemaker, so that the atria have time to fill the ventricles with blood, before the ventricles begin to contract?

A) AV bundle
B) SA node
C) Purkinje fibers
D) Left and right bundle branches
E) AV node

Question 10

There is a short period of time in the cardiac cycle, in which all four heart chambers are in diastole.

Question 11

The ECG is a recording of an action potential of a single cardiac muscle cell.

Question 12

Which portion(s) of the cardiac conduction system is/are found in the right atrium of the heart?

A) SA node and AV node
B) AV bundle and the bundle branches
C) Purkinje fibers
D) AV bundle
E) SA node

Question 13

Typically, ventricular diastole has a longer duration than ventricular systole.

Question 14

Which of the following portions of the ECG represents ventricular repolarization?

A) The T wave
B) The P-R segment
C) The QRS complex
D) The P wave
E) The P-R interval

Question 15

The results of the ECG with various leads (arrangements of positive and negative electrodes) are identical, so it does not matter which lead is used.