Question 1

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

Accepted Answer

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

Question 2

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

Accepted Answer

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

Question 3

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

Accepted Answer

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

Question 4

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

Accepted Answer

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

Question 5

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

Accepted Answer

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

Question 6

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

Accepted Answer

A) Opening of the atrioventricular valves 
B) Opening of the semilunar valves 
C) Closing of the atrioventricular valves 
D) Closing of the semilunar valves 
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 7

Which heart chamber lacks a group of pacemaker cells?

Accepted Answer

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

Question 8

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?

Accepted Answer

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

Question 9

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

Accepted Answer

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. 
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 10

-Identify the ECG component labeled "h."

Accepted Answer

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

Question 11

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

Accepted Answer

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

Question 12

-Identify the structure labeled "e."

Accepted Answer

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

Question 13

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

Accepted Answer

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

Question 14

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

Accepted Answer

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 
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 15

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

Accepted Answer

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. 
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 16

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

Accepted Answer

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

Question 17

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

Accepted Answer

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

Question 18

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

Accepted Answer

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 
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 19

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

Accepted Answer

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

Question 20

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?

Accepted Answer

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

Exam 21: Physiology of the Heart

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

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

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

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

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

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

Which heart chamber lacks a group of pacemaker cells?

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?

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

-Identify the ECG component labeled "h."

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

-Identify the structure labeled "e."

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

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

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

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

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

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

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

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?

Introduction to Anatomy and Physiology

Introduction to the Organ Systems

Chemistry

The Microscope

The Cell

Histology

The Integumentary System

Introduction to the Skeletal System

The Axial Skeleton

The Appendicular Skeleton

Joints

Introduction to the Muscular System: Muscle Tissue

Gross Anatomy of the Muscular System

Introduction to the Nervous System

The Central Nervous System: Brain and Spinal Cord

The Peripheral Nervous System: Nerves and Autonomic Nervous System

General and Special Senses

The Endocrine System

Blood

Anatomy of the Heart

Anatomy of Blood Vessels

Circulatory Pathways and the Physiology of Blood Vessels

The Lymphatic System

Anatomy of the Respiratory System

Physiology of the Respiratory System

Anatomy of the Digestive System

Physiology of the Digestive System

Anatomy of the Urinary System

Physiology of the Urinary System

Reproductive and Development

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