Deck 21: Physiology of the Heart

Question 1

What is the term used to describe the chart produced when recording the electrical activity of heart?

A)Electroencephalogram
B)Electromyogram
C)Electrocardiogram
D)Electrointrinsogram

Answer 1

C

Question 2

Which heart chamber lacks a group of pacemaker cells?

A)Left atrium
B)Right atrium
C)Left ventricle
D)Right ventricle

Answer 2

A

Question 3

Which component of the ECG represents the repolarization of the ventricles?

A)P-R interval
B)S-T segment
C)P wave
D)T wave

Answer 3

T wave

Question 4

What action causes the first heart sound heard through a stethoscope?

A)Opening of the semilunar valves
B)Closing of the atrioventricular valves
C)Closing of the semilunar valves
D)Opening of the atrioventricular valves

Question 5

Identify the structure labeled "b."

A)SA node
B)AV node
C)AV bundle
D)Terminal branch

Question 6

Which component of the cardiac conduction system receives action potentials from the sinoatrial node?

A)SA node
B)Terminal branches
C)AV node
D)Left bundle branch

Question 7

What action causes the second heart sound heard through a stethoscope?

A)Opening of the atrioventricular valves
B)Opening of the semilunar valves
C)Closing of the atrioventricular valves
D)Closing of the semilunar valves

Question 8

During the BIOPAC activity, why did the subject's heart rate increase after exercise?

A)The body needs to increase its number of red blood cells.
B)The body needs to have stronger muscle contractions.
C)The body has a greater demand for oxygen.
D)The body has a lower demand for nutrients.

Question 9

Identify the ECG component labeled "b."

A)S-T segment
B)Isoelectric line
C)QRS complex
D)T Wave

Question 10

Which component of the ECG represents the depolarization of the ventricles?

A)QRS complex
B)R-R interval
C)P-R segment
D)S-T segment

Question 11

Identify the ECG component labeled "h."

A)P wave
B)Q-T interval
C)P-R interval
D)R-R interval

Question 12

What is the direct source of the heart sounds in a heart beat?

A)Contraction of ventricles
B)Rush of blood through the chambers
C)Blood turbulence resulting from valve closure
D)Electrical impulse between the SA and AV nodes

Question 13

If the rate of atrial depolarization was normal while the rate of ventricular depolarization was slower than normal, where would you expect to find a dysfunction in the electrical conduction pathway of the heart?

A)Atrioventricular bundle
B)Sinoatrial node
C)Atrioventricular node
D)Terminal bundles

Question 14

Identify the structure labeled "e."

A)Left bundle branch
B)Right bundle branch
C)Terminal branch
D)AV bundle

Question 15

How many electrodes should be attached to the left forearm to record a three-lead ECG?

A)Three
B)Zero
C)One
D)Two

Question 16

What is the first of the deflection waves on a typical ECG?

A)T wave
B)P-Q wave
C)QRS complex
D)P wave

Question 17

Which statement is true regarding the difference between resting and vigorous activity ECGs?

A)Heartbeat is slower and the QRS segment is higher after exercise.
B)Heartbeat is faster and the S-T segment is shorter after exercise.
C)Heartbeat is faster and the P wave is higher after exercise.
D)Heartbeat is slower and the P-R segment is longer after exercise.

Question 18

During the BIOPAC activity, why did the subject's Q-T interval shorten after physical exercise?

A)Because the heart contractions are stronger
B)Because the heart muscle is receiving too much oxygen
C)Because the heart is beating faster, the length of time for a ventricular contraction must shorten.
D)Because the heart is beating too fast and the heart is compensating

Question 19

What is the anatomical term for the "pacemaker" of the heart?

A)Terminal branch
B)Bundle branch
C)AV node
D)SA node

Question 20

Which component of the cardiac conduction system extends through the interventricular septum toward the apex of the heart?

A)SA node
B)AV bundle
C)AV node
D)Right and left bundle branches

Question 21

Which of the following ECG components represents a lack of electrical activity?

A)Isoelectric line
B)P-R interval
C)Q-T interval
D)T-wave

Question 22

Which of the following ECG components decreases in length during exercise?

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

Question 23

Which of the following valve closings can be auscultated during the "dupp" heart sound by placing the stethoscope at the left sternal border of the second intercostal space?

A)Pulmonary semilunar
B)Right atrioventricular (tricuspid)
C)Left atrioventricular (mitral)
D)Aortic semilunar