Question 1

The pacemaker of the heart is located in the upper wall of the

Accepted Answer

A)  right atrium. 
B)  right ventricle. 
C)  left atrium. 
D)  left ventricle. 
A)  right atrium. 
B)  right ventricle. 
C)  left atrium. 
D)  left ventricle.

Question 2

An accumulation of excess fluid in the pericardial space

Accepted Answer

A)  causes external compression of the heart. 
B)  depresses the SA node, thereby eliminating pacemaker activity. 
C)  causes valvular stenosis. 
D)  causes a left-to-right shunt. 
A)  causes external compression of the heart. 
B)  depresses the SA node, thereby eliminating pacemaker activity. 
C)  causes valvular stenosis. 
D)  causes a left-to-right shunt.

Question 3

The atrioventricular node (AV node)

Accepted Answer

A)  is the pacemaker of the heart. 
B)  is located in the upper part of the right atrium. 
C)  has a rate that is normally faster than the SA node. 
D)  delays the electrical signal coming from the atria into the ventricles. 
A)  is the pacemaker of the heart. 
B)  is located in the upper part of the right atrium. 
C)  has a rate that is normally faster than the SA node. 
D)  delays the electrical signal coming from the atria into the ventricles.

Question 4

Which cavity first receives unoxygenated blood from the vena cava?

Accepted Answer

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

Question 5

What are the conducting fibers that rapidly spread the electrical signal throughout the ventricles?

Accepted Answer

A)  Bundle of His 
B)  Purkinje fibers 
C)  SA node 
D)  AV node 
A)  Bundle of His 
B)  Purkinje fibers 
C)  SA node 
D)  AV node

Question 6

Why may a "racing heart" (170 bpm)cause chest pain?

Accepted Answer

A)  Chemicals produced by the metabolizing cells stimulate the vagal pain receptors. 
B)  A racing heart decreases diastole, the period when coronary blood flow is maximal. 
C)  A racing heart decreases the time that the heart spends in systole. 
D)  Excess waste produced by metabolizing myocardial cells causes microthrombi to accumulate in the coronary arteries. 
A)  Chemicals produced by the metabolizing cells stimulate the vagal pain receptors. 
B)  A racing heart decreases diastole, the period when coronary blood flow is maximal. 
C)  A racing heart decreases the time that the heart spends in systole. 
D)  Excess waste produced by metabolizing myocardial cells causes microthrombi to accumulate in the coronary arteries.

Question 7

What event causes the pulmonic valve to open?

Accepted Answer

A)  The P wave 
B)  An increase in the pressure within the right ventricle 
C)  "Lubb-dupp" 
D)  Contraction of the chordae tendineae 
A)  The P wave 
B)  An increase in the pressure within the right ventricle 
C)  "Lubb-dupp" 
D)  Contraction of the chordae tendineae

Question 8

During ventricular contraction,the

Accepted Answer

A)  AV valves close in response to intraventricular pressure. 
B)  ECG is displaying the T wave. 
C)  semilunar valves close, causing S1. 
D)  ECG is displaying the P-R interval. 
A)  AV valves close in response to intraventricular pressure. 
B)  ECG is displaying the T wave. 
C)  semilunar valves close, causing S1. 
D)  ECG is displaying the P-R interval.

Question 9

The Purkinje fibers

Accepted Answer

A)  open valves. 
B)  pull on the cusps of the valves. 
C)  conduct electrical signals throughout the ventricles. 
D)  close valves. 
A)  open valves. 
B)  pull on the cusps of the valves. 
C)  conduct electrical signals throughout the ventricles. 
D)  close valves.

Question 10

Which structure "sees" oxygenated blood?

Accepted Answer

A)  Tricuspid valve 
B)  Pulmonary artery 
C)  Pulmonary veins 
D)  Right semilunar valve 
A)  Tricuspid valve 
B)  Pulmonary artery 
C)  Pulmonary veins 
D)  Right semilunar valve

Question 11

Which group is incorrect?

Accepted Answer

A)  Atrioventricular valves: tricuspid, bicuspid, mitral 
B)  Layers of the heart: epicardium, myocardium, endocardium 
C)  Abnormal heart rates: tachycardia, bradycardia 
D)  Parts of the conduction system: SA node, AV node, bundle of His, Purkinje fibers, medulla oblongata 
A)  Atrioventricular valves: tricuspid, bicuspid, mitral 
B)  Layers of the heart: epicardium, myocardium, endocardium 
C)  Abnormal heart rates: tachycardia, bradycardia 
D)  Parts of the conduction system: SA node, AV node, bundle of His, Purkinje fibers, medulla oblongata

Question 12

What is located at the second rib and fifth intercostal space?

Accepted Answer

A)  Base and apex of the heart 
B)  Semilunar valves 
C)  AV valves 
D)  SA node and AV nodes 
A)  Base and apex of the heart 
B)  Semilunar valves 
C)  AV valves 
D)  SA node and AV nodes

Question 13

Which of the following is located between the visceral and parietal pericardium?

Accepted Answer

A)  The mediastinum 
B)  A space that contains serous fluid 
C)  The precordium 
D)  The endocardium 
A)  The mediastinum 
B)  A space that contains serous fluid 
C)  The precordium 
D)  The endocardium

Question 14

Which of the following must precede ventricular contraction?

Accepted Answer

A)  Ventricular systole 
B)  "Lubb-dupp" 
C)  Ventricular depolarization 
D)  Closing of the AV valves 
A)  Ventricular systole 
B)  "Lubb-dupp" 
C)  Ventricular depolarization 
D)  Closing of the AV valves

Question 15

The epicardium is a layer of the

Accepted Answer

A)  myocardium. 
B)  diaphragm. 
C)  pericardium. 
D)  endocardium. 
A)  myocardium. 
B)  diaphragm. 
C)  pericardium. 
D)  endocardium.

Question 16

The intent is to measure pulmonary wedge pressure,a procedure that requires the advancement of a catheter up to the pulmonary capillaries.The catheter is inserted into the left subclavian vein.Identify the structure that the catheter does not pass through on its way to the pulmonary capillaries.

Accepted Answer

A)  Right atrium 
B)  Tricuspid valve 
C)  Pulmonic valve 
D)  Pulmonary veins 
A)  Right atrium 
B)  Tricuspid valve 
C)  Pulmonic valve 
D)  Pulmonary veins

Question 17

Which group is incorrect?

Accepted Answer

A)  Semilunar valves: pulmonic, aortic 
B)  Structures that carry oxygenated blood: pulmonary veins, left ventricle, aorta 
C)  Layers of the heart: epicardium, myocardium, endocardium 
D)  Abnormal heart rates: tachycardia, bradycardia, normal sinus rhythm 
A)  Semilunar valves: pulmonic, aortic 
B)  Structures that carry oxygenated blood: pulmonary veins, left ventricle, aorta 
C)  Layers of the heart: epicardium, myocardium, endocardium 
D)  Abnormal heart rates: tachycardia, bradycardia, normal sinus rhythm

Question 18

Which of the following is responsible for the opening and closing of the heart valves?

Accepted Answer

A)  Pressure exerted on the valves as the heart contracts and relaxes 
B)  Electrical signals arising in the SA node 
C)  The degree of oxygen concentration of blood in the ventricles 
D)  The amount of blood in the heart 
A)  Pressure exerted on the valves as the heart contracts and relaxes 
B)  Electrical signals arising in the SA node 
C)  The degree of oxygen concentration of blood in the ventricles 
D)  The amount of blood in the heart

Question 19

Which of the following electrical events is caused by the outflow (efflux)of K⁺?

Accepted Answer

A)  P-R interval 
B)  Depolarization 
C)  QRS complex 
D)  Repolarization 
A)  P-R interval 
B)  Depolarization 
C)  QRS complex 
D)  Repolarization

Question 20

Which of the following is most descriptive of the tricuspid valve?

Accepted Answer

A)  "Sees" oxygenated blood 
B)  Entrance valve: right ventricle 
C)  Exit valve: right ventricle 
D)  Semilunar valve 
A)  "Sees" oxygenated blood 
B)  Entrance valve: right ventricle 
C)  Exit valve: right ventricle 
D)  Semilunar valve

Exam 16: Anatomy of the Heart

The pacemaker of the heart is located in the upper wall of the

An accumulation of excess fluid in the pericardial space

The atrioventricular node (AV node)

Which cavity first receives unoxygenated blood from the vena cava?

What are the conducting fibers that rapidly spread the electrical signal throughout the ventricles?

Why may a "racing heart" (170 bpm)cause chest pain?

What event causes the pulmonic valve to open?

During ventricular contraction,the

The Purkinje fibers

Which structure "sees" oxygenated blood?

Which group is incorrect?

What is located at the second rib and fifth intercostal space?

Which of the following is located between the visceral and parietal pericardium?

Which of the following must precede ventricular contraction?

The epicardium is a layer of the

The intent is to measure pulmonary wedge pressure,a procedure that requires the advancement of a catheter up to the pulmonary capillaries.The catheter is inserted into the left subclavian vein.Identify the structure that the catheter does not pass through on its way to the pulmonary capillaries.

Which group is incorrect?

Which of the following is responsible for the opening and closing of the heart valves?

Which of the following electrical events is caused by the outflow (efflux)of K⁺?

Which of the following is most descriptive of the tricuspid valve?

Introduction to the Human Body

Basic Chemistry

Cells

Cell Metabolism

Microbiology Basics

Tissues and Membranes

Integumentary System and Body Temperature

Skeletal System

Muscular System

Nervous System: Nervous Tissue and Brain

Nervous System: Spinal Cord and Peripheral Nerves

Autonomic Nervous System

Sensory System

Endocrine System

Blood

Function of the Heart

Anatomy of the Blood Vessels

Functions of the Blood Vessels

Lymphatic System

Immune System

Respiratory System

Digestive System

Urinary System

Water, Electrolyte, and Acid-Base Balance

Reproductive Systems

Human Development and Heredity

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