Question 1

If the SA node is nonfunctional,which of the following is most likely to occur?

Accepted Answer

A) The heart will go into asystole (stop). 
B) Tachycardia will develop. 
C) Another portion of the heart will become the pacemaker. 
D) The heart will go into defibrillation. 
E) The heart will be desensitized. 
A) The heart will go into asystole (stop). 
B) Tachycardia will develop. 
C) Another portion of the heart will become the pacemaker. 
D) The heart will go into defibrillation. 
E) The heart will be desensitized.

Question 2

As soon as left ventricular pressure exceeds the pressure in the aorta,the

Accepted Answer

A) AV valves open. 
B) aortic semilunar valve opens. 
C) atria pump blood into the ventricles. 
D) ventricles pump blood into the atria. 
E) pulmonary semilunar valve closes. 
A) AV valves open. 
B) aortic semilunar valve opens. 
C) atria pump blood into the ventricles. 
D) ventricles pump blood into the atria. 
E) pulmonary semilunar valve closes.

Question 3

The chordae tendineae

Accepted Answer

A) connect the atria to the ventricles. 
B) are found in the interventricular septum. 
C) are part of the conducting system of the heart. 
D) connect the flaps of the AV valves to the papillary muscles. 
E) are a part of the myocardium. 
A) connect the atria to the ventricles. 
B) are found in the interventricular septum. 
C) are part of the conducting system of the heart. 
D) connect the flaps of the AV valves to the papillary muscles. 
E) are a part of the myocardium.

Question 4

Blood vessels enter and exit from the _____ of the heart.

Accepted Answer

A) apex 
B) base 
C) auricles 
D) trigone 
E) inferior aspect 
A) apex 
B) base 
C) auricles 
D) trigone 
E) inferior aspect

Question 5

Depolarization of a cardiac muscle cell occurs as the result of

Accepted Answer

A) a decrease in the permeability of the cell membrane to sodium. 
B) the opening of voltage-gated sodium channels and voltage-gated calcium channels. 
C) the closure of voltage-gated calcium channels. 
D) the opening of voltage-gated potassium channels. 
E) the closure of the voltage-gated sodium channels. 
A) a decrease in the permeability of the cell membrane to sodium. 
B) the opening of voltage-gated sodium channels and voltage-gated calcium channels. 
C) the closure of voltage-gated calcium channels. 
D) the opening of voltage-gated potassium channels. 
E) the closure of the voltage-gated sodium channels.

Question 6

Pressure in the right ventricle must exceed pressure in the ____ before the right ventricle can eject blood.

Accepted Answer

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

Question 7

The first and second heart sounds are most directly related to

Accepted Answer

A) pulse pressure in the aorta. 
B) the contraction of the atria. 
C) vibrations that occur when the valves close. 
D) contraction of the papillary muscles. 
E) the flow of the blood. 
A) pulse pressure in the aorta. 
B) the contraction of the atria. 
C) vibrations that occur when the valves close. 
D) contraction of the papillary muscles. 
E) the flow of the blood.

Question 8

Diagnostic tests done on a patient show that many coronary arteries,including the left main coronary artery are severely narrowed.Which of the following is the best course of action to treat this patient?

Accepted Answer

A)  Angiogram 
B)  Angioplasty 
C)  Coronary bypass surgery 
D)  Electrocardiogram 
E)  Urokinase injections 
A)  Angiogram 
B)  Angioplasty 
C)  Coronary bypass surgery 
D)  Electrocardiogram 
E)  Urokinase injections

Question 9

The plateau phase seen during the action potential of a cardiac muscle cell is due to the

Accepted Answer

A) sodium-potassium pump. 
B) opening of sodium channels. 
C) continuing to have open calcium channels. 
D) closure of chloride channels. 
E) closing of calcium channels. 
A) sodium-potassium pump. 
B) opening of sodium channels. 
C) continuing to have open calcium channels. 
D) closure of chloride channels. 
E) closing of calcium channels.

Question 10

During the isovolumetric contraction period of the cardiac cycle,

Accepted Answer

A) AV and semilunar valves are closed. 
B) the atria are contracted. 
C) ventricular volume increases. 
D) blood is pumped into the large arteries. 
E) pressure in the ventricles decreases. 
A) AV and semilunar valves are closed. 
B) the atria are contracted. 
C) ventricular volume increases. 
D) blood is pumped into the large arteries. 
E) pressure in the ventricles decreases.

Question 11

Blood flow through the coronary blood vessels decreases during myocardial contraction and increases during myocardial relaxation.

Accepted Answer

A) True 
 B)False

Question 12

The tricuspid valve is closed

Accepted Answer

A) during active filling of the ventricles. 
B) when the mitral valve is open. 
C) while the atria are contracting. 
D) during ejection. 
E) during passive filling of the ventricles. 
A) during active filling of the ventricles. 
B) when the mitral valve is open. 
C) while the atria are contracting. 
D) during ejection. 
E) during passive filling of the ventricles.

Question 13

Angina pectoris is chest pain caused by reduced

Accepted Answer

A) stimulation of the myocardium. 
B) blood supply to cardiac muscle. 
C) fluid in the pericardial sac. 
D) contractility of the heart. 
E) action potentials from SA node. 
A) stimulation of the myocardium. 
B) blood supply to cardiac muscle. 
C) fluid in the pericardial sac. 
D) contractility of the heart. 
E) action potentials from SA node.

Question 14

Where is blood moving during the period of ejection?

Accepted Answer

A)  Ventricles to atria 
B)  Ventricles to great vessels 
C)  Atria to ventricles 
D)  Atria to great vessels 
E)  Great vessels to ventricles 
A)  Ventricles to atria 
B)  Ventricles to great vessels 
C)  Atria to ventricles 
D)  Atria to great vessels 
E)  Great vessels to ventricles

Question 15

Of the types of damage resulting from a myocardial infarction,which is most likely to cause the greatest increase in the Q-T interval?

Accepted Answer

A) infarction in the AV node 
B) left bundle branch block 
C) infarction affecting the SA node 
D) tachycardia 
E) ectopic focus 
A) infarction in the AV node 
B) left bundle branch block 
C) infarction affecting the SA node 
D) tachycardia 
E) ectopic focus

Question 16

The right side of the heart receives blood from the body and pumps through _________ circulation to the lungs.

Accepted Answer

A) hepatic 
B) pulmonary 
C) peripheral 
D) systemic 
A) hepatic 
B) pulmonary 
C) peripheral 
D) systemic

Question 17

The chamber of the heart that endures the highest pressure is the

Accepted Answer

A) right atrium. 
B) left atrium. 
C) right ventricle. 
D) left ventricle. 
E) coronary sinus. 
A) right atrium. 
B) left atrium. 
C) right ventricle. 
D) left ventricle. 
E) coronary sinus.

Question 18

Increased vagal stimulation would cause

Accepted Answer

A) the heart rate to decrease. 
B) the heart rate to increase. 
C) force of contraction to increase. 
D) stroke volume to increase. 
E) no change in heart rate,stroke volume,or force of contraction. 
A) the heart rate to decrease. 
B) the heart rate to increase. 
C) force of contraction to increase. 
D) stroke volume to increase. 
E) no change in heart rate,stroke volume,or force of contraction.

Question 19

Chemoreceptors sensitive to blood carbon dioxide levels are primarily located in the

Accepted Answer

A) medulla oblongata. 
B) carotid arteries. 
C) right atrium. 
D) left ventricle. 
E) jugular veins. 
A) medulla oblongata. 
B) carotid arteries. 
C) right atrium. 
D) left ventricle. 
E) jugular veins.

Question 20

Which of the following is mismatched?

Accepted Answer

A) opening of sodium channels - depolarization 
B) closing of calcium channels - plateau phase 
C) opening of potassium channels - rapid repolarization 
D) closure of sodium channels - early repolarization 
E) opening of calcium channels - plateau phase 
A) opening of sodium channels - depolarization 
B) closing of calcium channels - plateau phase 
C) opening of potassium channels - rapid repolarization 
D) closure of sodium channels - early repolarization 
E) opening of calcium channels - plateau phase

Exam 20: Cardiovascular System: the Heart

If the SA node is nonfunctional,which of the following is most likely to occur?

As soon as left ventricular pressure exceeds the pressure in the aorta,the

The chordae tendineae

Blood vessels enter and exit from the _____ of the heart.

Depolarization of a cardiac muscle cell occurs as the result of

Pressure in the right ventricle must exceed pressure in the ____ before the right ventricle can eject blood.

The first and second heart sounds are most directly related to

Diagnostic tests done on a patient show that many coronary arteries,including the left main coronary artery are severely narrowed.Which of the following is the best course of action to treat this patient?

The plateau phase seen during the action potential of a cardiac muscle cell is due to the

During the isovolumetric contraction period of the cardiac cycle,

Blood flow through the coronary blood vessels decreases during myocardial contraction and increases during myocardial relaxation.

The tricuspid valve is closed

Angina pectoris is chest pain caused by reduced

Where is blood moving during the period of ejection?

Of the types of damage resulting from a myocardial infarction,which is most likely to cause the greatest increase in the Q-T interval?

The right side of the heart receives blood from the body and pumps through _________ circulation to the lungs.

The chamber of the heart that endures the highest pressure is the

Increased vagal stimulation would cause

Chemoreceptors sensitive to blood carbon dioxide levels are primarily located in the

Which of the following is mismatched?

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