Question 1

-Blood exits this chamber when it passes through the tricuspid valve.

Accepted Answer

The answer of 
-Blood exits this chamber when it passes...

Question 2

-This chamber pumps blood to the pulmonary circuit.

Accepted Answer

The answer of 
-This chamber pumps blood to the pulmonary...

Question 3

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.F) C) and D)
G) A) and D)

Question 4

-The figure illustrates the cardiac action potential. What does "C" represent?

Accepted Answer

A)   early repolarization phase
B)   plateau phase
C)   final repolarization phase
D)   depolarization phaseE) None of the above
F) B) and D)

Question 5

A heart rate in excess of 100 BPM is called __________.

Accepted Answer

The answer of A heart rate in excess of 100...

Question 6

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.F) B) and E)
G) B) and C)

Question 7

Which of the following factors would cause an increase in heart rate?

Accepted Answer

A)   increased parasympathetic stimulation
B)   stimulation of baroreceptors in the aorta
C)   increased epinephrine release from the adrenal medulla
D)   increased production of atrial natriuretic factor
E)   vagal stimulationF) All of the above
G) A) and C)

Question 8

Fred was admitted to the cardiac unit with chest pains. No arrhythmias and no large changes in the heart rate were observable. Blood samples taken over the next few days showed no increase in enzymes such as creatine phosphokinase. A possible treatment of the condition is

Accepted Answer

A)   beta adrenergic blocking agents.
B)   nitroglycerin.
C)   calcium channel blocking agents.
D)   aspirin.
E)   exercise.F) None of the above
G) A) and B)

Question 9

Match the blood vessel with the appropriate description.
-pulmonary trunk

Accepted Answer

A)  returns blood to the heart from the lower extremities
B)  returns blood to the heart from the lungs
C)  carries blood from the left ventricle into systemic circulation
D)  returns blood to the heart from the head and neck
E)  carries blood from the right ventricle to the lungsF) B) and E)
G) D) and E)

Question 10

Use the following key to mark the most correct answer.
-(1)  rate of spontaneous generation of action potentials by the SA node;
(2)  rate of spontaneous generation of action potentials by the AV node
A

Accepted Answer

A)  Choose A if the first item is greater than the second item.
B)  Choose B if the first item is less than the second item.
C)  Choose C if the first item is equal or nearly equal to the second item.D) All of the above
E) None of the above

Question 11

Lowered extracellular potassium levels will lower the heart rate because

Accepted Answer

A)   the resting membrane potential is hyperpolarized.
B)   ectopic action potentials occur.
C)   action potential amplitude declines.
D)   more sodium channels open.
E)   it blocks calcium channels.F) A) and B)
G) A) and D)

Question 12

The right atrium receives blood from

Accepted Answer

A)   the lungs and the heart.
B)   the heart.
C)   the body and the heart.
D)   the lungs and the body.E) A) and D)
F) A) and C)

Question 13

The spontaneous opening of sodium channels marks the beginning of ____ of a myocardial cell.

Accepted Answer

A)   depolarization
B)   repolarization
C)   hyperpolarization
D)   isopolarization
E)   afterpolarizationF) All of the above
G) None of the above

Question 14

Chemoreceptors sensitive to blood oxygen levels are primarily located in the

Accepted Answer

A)   medulla oblongata.
B)   carotid arteries.
C)   right atrium.
D)   left ventricle.
E)   jugular veins.F) None of the above
G) A) and B)

Question 15

What is the foramen ovale?

Accepted Answer

A)   An opening between the right and left atria in the embryo and fetus.
B)   An opening between the right and left ventricles in the embryo and fetus.
C)   An oval hole in the pericardium in the embryo and fetus.
D)   An opening between the pulmonary trunk and aorta in the embryo and fetus.E) C) and D)
F) A) and D)

Question 16

Blood in the pulmonary veins returns to the

Accepted Answer

A)   right atrium.
B)   left atrium.
C)   right ventricle.
D)   left ventricle.
E)   coronary sinus.F) None of the above
G) B) and D)

Question 17

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

Accepted Answer

A)   epicardium
B)   pericardium
C)   endocardium
D)   myocardium
E)   visceral pericardiumF) C) and D)
G) B) and E)

Question 18

Use the following two choices:
- ↓\downarrow↓  blood pressure

Accepted Answer

A)  ↑ heart rate
B)  ↓ heart rate C) A) and B)
D) undefined

Question 19

Match the blood vessel with the appropriate description.
-inferior vena cava

Accepted Answer

A)  returns blood to the heart from the lower extremities
B)  returns blood to the heart from the lungs
C)  carries blood from the left ventricle into systemic circulation
D)  returns blood to the heart from the head and neck
E)  carries blood from the right ventricle to the lungsF) B) and E)
G) A) and B)

Question 20

Which of the following is NOT a function of the heart?

Accepted Answer

A)   providing a location for gas exchange between oxygen and carbon dioxide
B)   regulating blood supply to tissues depending on need
C)   generating blood pressure through contraction
D)   routing blood to either the pulmonary or systemic circulationsE) B) and C)
F) None of the above

Exam 20: Cardiovascular System: the Heart

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

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The function of the pericardial fluid is to

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Match the blood vessel with the appropriate description. -inferior vena cava

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What is the foramen ovale?

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Fred was admitted to the cardiac unit with chest pains. No arrhythmias and no large changes in the heart rate were observable. Blood samples taken over the next few days showed no increase in enzymes such as creatine phosphokinase. A possible treatment of the condition is

Correct AnswerverifiedShow Answer

-The figure illustrates the cardiac action potential. What does "C" represent?

Correct AnswerverifiedShow Answer

The right atrium receives blood from

Correct AnswerverifiedShow Answer

The spontaneous opening of sodium channels marks the beginning of ____ of a myocardial cell.

Correct AnswerverifiedShow Answer

Chemoreceptors sensitive to blood oxygen levels are primarily located in the

Correct AnswerverifiedShow Answer

Use the following key to mark the most correct answer. -(1) rate of spontaneous generation of action potentials by the SA node; (2) rate of spontaneous generation of action potentials by the AV node A

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Use the following two choices: - ↓\downarrow↓ blood pressure

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-Blood exits this chamber when it passes through the tricuspid valve.

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Lowered extracellular potassium levels will lower the heart rate because

Correct AnswerverifiedShow Answer

-This chamber pumps blood to the pulmonary circuit.

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Which of the following is NOT a function of the heart?

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Which of the following factors would cause an increase in heart rate?

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Blood in the pulmonary veins returns to the

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Match the blood vessel with the appropriate description. -pulmonary trunk

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A heart rate in excess of 100 BPM is called __________.

Correct AnswerverifiedShow Answer

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

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Use the following two choices: - $\downarrow$ blood pressure

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