Question 1

An increase in extracellular calcium generally increases

Accepted Answer

A) the heart rate. 
B) the force of contraction. 
C) autonomic stimulation of the heart. 
D) sodium channel opening. 
E) the frequency of the action potentials. 
A) the heart rate. 
B) the force of contraction. 
C) autonomic stimulation of the heart. 
D) sodium channel opening. 
E) the frequency of the action potentials.

Question 2

An incompetent pulmonary semilunar valve could result in less blood reaching the

Accepted Answer

A) lungs. 
B) heart muscle. 
C) right ventricle. 
D) aorta. 
E) right atrium. 
A) lungs. 
B) heart muscle. 
C) right ventricle. 
D) aorta. 
E) right atrium.

Question 3

Which of the following statements regarding intrinsic regulation of the heart is true?

Accepted Answer

A) Stretching the SA node will decrease generation of action potentials in the node. 
B) Decreased venous return increases cardiac output. 
C) The heart's pumping effectiveness is greatly influenced by small changes in afterload. 
D) If cardiac muscle fibers are slightly stretched,they have a stronger contraction force. 
E) If cardiac muscle fibers are slightly stretched,they have a weaker contraction force. 
A) Stretching the SA node will decrease generation of action potentials in the node. 
B) Decreased venous return increases cardiac output. 
C) The heart's pumping effectiveness is greatly influenced by small changes in afterload. 
D) If cardiac muscle fibers are slightly stretched,they have a stronger contraction force. 
E) If cardiac muscle fibers are slightly stretched,they have a weaker contraction force.

Question 4

Which of the following layers forms the bulk of the heart wall?

Accepted Answer

A) epicardium 
B) pericardium 
C) endocardium 
D) myocardium 
E) visceral pericardium 
A) epicardium 
B) pericardium 
C) endocardium 
D) myocardium 
E) visceral pericardium

Question 5

During the ejection phase of the cardiac cycle,blood exits the left ventricle through the

Accepted Answer

A) aorta. 
B) coronary sinus. 
C) pulmonary vein. 
D) superior vena cava. 
E) pulmonary trunk. 
A) aorta. 
B) coronary sinus. 
C) pulmonary vein. 
D) superior vena cava. 
E) pulmonary trunk.

Question 6

Calcium channel blockers are frequently used to

Accepted Answer

A) increase the heart rate. 
B) treat tachycardia or other arrhythmias. 
C) speed up conduction of impulses through the AV node. 
D) slow the closing of potassium ion channels. 
E) treat bradycardia and low blood pressure. 
A) increase the heart rate. 
B) treat tachycardia or other arrhythmias. 
C) speed up conduction of impulses through the AV node. 
D) slow the closing of potassium ion channels. 
E) treat bradycardia and low blood pressure.

Question 7

What event(s)occur during the QRS complex of an ECG?

Accepted Answer

A) depolarization of the atria 
B) repolarization of the ventricles 
C) depolarization of the atria and repolarization of the ventricles 
D) depolarization of the ventricles and repolarization of the atria 
A) depolarization of the atria 
B) repolarization of the ventricles 
C) depolarization of the atria and repolarization of the ventricles 
D) depolarization of the ventricles and repolarization of the atria

Question 8

Under resting conditions,the normal stroke volume is approximately ___________.

Accepted Answer

A)  55 mL 
B)  70 mL 
C)  110 mL 
D)  125 mL 
E)  180 mL 
A)  55 mL 
B)  70 mL 
C)  110 mL 
D)  125 mL 
E)  180 mL

Question 9

Which blood vessel carries blood from the left ventricle?

Accepted Answer

A) aorta 
B) right atrium 
C) pulmonary trunk 
D) pulmonary arteries 
E) pulmonary veins 
A) aorta 
B) right atrium 
C) pulmonary trunk 
D) pulmonary arteries 
E) pulmonary veins

Question 10

End-diastolic volume minus end-systolic volume is equal to

Accepted Answer

A) cardiac output. 
B) cardiac reserve. 
C) pulse volume. 
D) venous return. 
E) stroke volume. 
A) cardiac output. 
B) cardiac reserve. 
C) pulse volume. 
D) venous return. 
E) stroke volume.

Question 11

The heart

Accepted Answer

A) is a four-chambered muscular pump. 
B) is posterior to the trachea. 
C) is lined with an epithelial layer called epicardium. 
D) lies mostly to the right of the midline of the sternum. 
E) has a superior apex and an inferior base. 
A) is a four-chambered muscular pump. 
B) is posterior to the trachea. 
C) is lined with an epithelial layer called epicardium. 
D) lies mostly to the right of the midline of the sternum. 
E) has a superior apex and an inferior base.

Question 12

Which of these statements is true?

Accepted Answer

A) The left coronary artery is a branch of the left pulmonary vein. 
B) The coronary sinus returns blood to the left atrium. 
C) The coronary arteries arise from the pulmonary trunk. 
D) The great cardiac vein collects blood from the left anterior surface of the heart. 
E) The pulmonary arteries carry blood to the left atrium. 
A) The left coronary artery is a branch of the left pulmonary vein. 
B) The coronary sinus returns blood to the left atrium. 
C) The coronary arteries arise from the pulmonary trunk. 
D) The great cardiac vein collects blood from the left anterior surface of the heart. 
E) The pulmonary arteries carry blood to the left atrium.

Question 13

What occurs during the time between the first heart sound and the second heart sound?

Accepted Answer

A) ventricular systole 
B) ventricular diastole 
C) ventricular filling 
D) atrial systole 
E) the P wave of the ECG 
A) ventricular systole 
B) ventricular diastole 
C) ventricular filling 
D) atrial systole 
E) the P wave of the ECG

Question 14

The function of the pericardial fluid is to

Accepted Answer

A) reduce friction between the pericardial membranes. 
B) lubricate the heart valves. 
C) replace any blood that is lost. 
D) provide oxygen and nutrients to the endocardium. 
E) stimulate the heart. 
A) reduce friction between the pericardial membranes. 
B) lubricate the heart valves. 
C) replace any blood that is lost. 
D) provide oxygen and nutrients to the endocardium. 
E) stimulate the heart.

Question 15

Which of the following sequences for the conducting system is correct?

Accepted Answer

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

Question 16

Energy for contraction of myocardial cells comes primarily from

Accepted Answer

A) aerobic respiration in the mitochondria. 
B) anaerobic respiration in the cytosol. 
C) glycolysis in the cytosol. 
D) ATP that is stored while the heart is not contracting. 
E) creatine phosphate. 
A) aerobic respiration in the mitochondria. 
B) anaerobic respiration in the cytosol. 
C) glycolysis in the cytosol. 
D) ATP that is stored while the heart is not contracting. 
E) creatine phosphate.

Question 17

Variations in respiratory rate is a symptom of

Accepted Answer

A) sinus arrhythmia. 
B) ventricular tachycardia. 
C) SA node block. 
D) paroxysmal atrial tachycardia 
A) sinus arrhythmia. 
B) ventricular tachycardia. 
C) SA node block. 
D) paroxysmal atrial tachycardia

Question 18

Which of the following will increase the heart rate?

Accepted Answer

A) a rise in pH 
B) an increase in the level of carbon dioxide in the blood 
C) an increase in the level of blood oxygen 
D) an increase in blood pressure 
E) a decrease in the level of carbon dioxide in the blood 
A) a rise in pH 
B) an increase in the level of carbon dioxide in the blood 
C) an increase in the level of blood oxygen 
D) an increase in blood pressure 
E) a decrease in the level of carbon dioxide in the blood

Question 19

Which of the following will depolarize immediately after the AV node depolarizes?

Accepted Answer

A) the AV bundle 
B) Purkinje fibers 
C) atrial myocardium 
D) bundle branches in the ventricular septum 
E) the SA node 
A) the AV bundle 
B) Purkinje fibers 
C) atrial myocardium 
D) bundle branches in the ventricular septum 
E) the SA node

Question 20

Which of the following is NOT an enzyme given to someone experiencing a myocardial infarction to break up blood clots?

Accepted Answer

A) streptokinase 
B) tissue plasminogen activator (t-Pa) 
C) nitroglycerin 
D) urokinase 
A) streptokinase 
B) tissue plasminogen activator (t-Pa) 
C) nitroglycerin 
D) urokinase

Exam 20: Cardiovascular System: the Heart

An increase in extracellular calcium generally increases

An incompetent pulmonary semilunar valve could result in less blood reaching the

Which of the following statements regarding intrinsic regulation of the heart is true?

Which of the following layers forms the bulk of the heart wall?

During the ejection phase of the cardiac cycle,blood exits the left ventricle through the

Calcium channel blockers are frequently used to

What event(s)occur during the QRS complex of an ECG?

Under resting conditions,the normal stroke volume is approximately ___________.

Which blood vessel carries blood from the left ventricle?

End-diastolic volume minus end-systolic volume is equal to

The heart

Which of these statements is true?

What occurs during the time between the first heart sound and the second heart sound?

The function of the pericardial fluid is to

Which of the following sequences for the conducting system is correct?

Energy for contraction of myocardial cells comes primarily from

Variations in respiratory rate is a symptom of

Which of the following will increase the heart rate?

Which of the following will depolarize immediately after the AV node depolarizes?

Which of the following is NOT an enzyme given to someone experiencing a myocardial infarction to break up blood clots?

The Human Organism

The Chemical Basis of Life

Cell Biology

Tissues

Integumentary System

Skeletal System: Bones and Bone Tissue

Skeletal System: Gross Anatomy

Joints and Movement

Muscular System: Histology and Physiology

Muscular System: Gross Anatomy

Functional Organization of Nervous Tissue

Spinal Cord and Spinal Nerves

Brain and Cranial Nerves

Integration of Nervous System Functions

The Special Senses

Autonomic Nervous System

Functional Organization of the Endocrine System

Endocrine Glands

Cardiovascular System: Blood

Cardiovascular System: Blood Vessels and Circulation

Lymphatic System and Immunity

Respiratory System

Digestive System

Nutrition,metabolism,and Temperature Regulation

Urinary System

Water,electrolyte,and Acid-Based Balance

Reproductive System

Development,growth,aging,and Genetics

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