Question 1

The ________ carry blood toward the lungs.

Accepted Answer

A)   pulmonary arteries and veins
B)   pulmonary trunk and arteries
C)   pulmonary trunk and veins
D)   superior and inferior venae cavae
E)   aorta and pulmonary arteriesF) B) and C)
G) A) and E)

Question 2

The product of the stroke volume times the heart rate is known as the

Accepted Answer

A)   end-diastolic volume.
B)   end-systolic volume.
C)   cardiac output.
D)   cardiac reserve.
E)   venous return.F) C) and D)
G) B) and C)

Question 3

All of the following characteristics of the sarcoplasmic reticulum in cardiac muscle cells are true except

Accepted Answer

A)   it is more irregular than that in skeletal muscle fibers.
B)   it is in close association with the transverse tubules.
C)   it is involved in the storage and release of Ca2+.
D)   it has enlarged terminal cisternae like skeletal muscle fibers.E) A) and B)
F) C) and D)

Question 4

In a normal electrocardiogram, the

Accepted Answer

A)   P wave results from repolarization of the atria.
B)   QRS complex results from ventricular depolarization.
C)   P wave occurs after the QRS complex but before the T wave.
D)   T wave represents depolarization of the atria.
E)   repolarization of the atria is clearly visible.F) C) and D)
G) B) and D)

Question 5

The ________ valve guards the entrance to the ________, which carries ________ blood to the lungs.

Accepted Answer

A)   bicuspid; aorta; oxygenated
B)   mitral; pulmonary trunk; oxygenated
C)   pulmonary semilunar; pulmonary trunk; deoxygenated
D)   aortic; aorta; deoxygenatedE) None of the above
F) A) and D)

Question 6

When sodium channels are fully open, the membrane of the ventricular cardiac muscle cells ________.

Accepted Answer

A)   sharply hyperpolarizes
B)   sharply repolarizes
C)   sharply depolarizes
D)   plateaus
E)   has no responseF) C) and D)
G) A) and C)

Question 7

Which statement correctly identifies the phase of the cardiac cycle that occurs when the pressure in the ventricles is lower than the pressure in the great arteries but greater than the pressure in the atria?

Accepted Answer

A)   Passive ventricular filling
B)   Period of ejection
C)   Period of isovolumetric contraction
D)   Active ventricular fillingE) None of the above
F) A) and B)

Question 8

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 Na+ channels.
C)   continuing to have open Ca2+ channels.
D)   closure of Cl− channels.
E)   closing of Ca2+ channels.F) A) and E)
G) A) and D)

Question 9

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

Accepted Answer

A)   hepatic
B)   pulmonary
C)   peripheral
D)   systemicE) None of the above
F) A) and B)

Question 10

When the aortic semilunar valve closes and blood bounces off of it, it produces the ________ heart sound that is ultimately related to when the ________.

Accepted Answer

A)   lubb (S1) ; atria contract
B)   dupp (S2) ; atria relax
C)   lubb (S1) ; ventricles contract
D)   dupp (S2) ; ventricles relax
E)   lubb (S1) ; ventricles relaxF) A) and B)
G) D) and E)

Question 11

Most of the ventricle filling occurs ________.

Accepted Answer

A)   during atrial systole
B)   when the AV valve is closed
C)   during ventricular systole
D)   during atrial diastole
E)   during isovolumetric contractionF) C) and E)
G) B) and D)

Question 12

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 fibersF) C) and D)
G) None of the above

Question 13

Energy for contraction of cardiac muscle 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.F) A) and B)
G) None of the above

Question 14

When comparing cardiac muscle cells and skeletal muscle cells,

Accepted Answer

A)   the rate of action potential propagation is faster in cardiac muscle.
B)   both possess intercalated discs.
C)   only skeletal muscle has a plateau phase in its contraction cycle.
D)   action potentials are conducted from cell to cell only in cardiac muscle.
E)   both are voluntary.F) A) and B)
G) A) and E)

Question 15

Which vessels empty blood into the left atrium?

Accepted Answer

A)   Aorta
B)   Right atrium
C)   Pulmonary trunk
D)   Pulmonary arteries
E)   Pulmonary veinsF) None of the above
G) C) and E)

Question 16

Obstruction of the ________ will cause a more severe myocardial infarction (MI)  than the obstruction of any of the others.

Accepted Answer

A)   left marginal vein
B)   left coronary artery (LC
A)  
C)   posterior interventricular vein
D)   anterior interventricular branch
E)   circumflex branchF) C) and E)
G) D) and E)

Question 17

The cardioregulatory center of the brain is located in the

Accepted Answer

A)   hypothalamus.
B)   medulla oblongata.
C)   cerebellum.
D)   cerebrum.
E)   diencephalons.F) C) and D)
G) A) and E)

Question 18

The dicrotic notch in the aortic pressure curve is due to the

Accepted Answer

A)   increase in intraventricular pressure during ejection.
B)   backflow of blood toward the ventricles.
C)   closure of the left AV valve.
D)   elasticity of the arterial wall.
E)   closure of the semilunar valves.F) B) and E)
G) A) and B)

Question 19

Assume that the left ventricle of a child's heart has an EDV=90mL, and ESV=60mL, and a cardiac output of 2,400 mL/min. His SV is ________ mL/beat, and his HR is ________ bpm.

Accepted Answer

A)   30; 80
B)   40; 60
C)   80; 30
D)   150; 16
E)   16; 150F) D) and E)
G) C) and E)

Question 20

A stab wound into the heart can result in cardiac tamponade. This means that

Accepted Answer

A)   blood enters the pleural cavity.
B)   the heart is compressed by blood in the pericardial sac.
C)   the electrical conduction system of the heart is damaged.
D)   the left coronary artery has been damaged or cut.
E)   the heart has lost all of its blood.F) C) and D)
G) A) and B)

Exam 20: Cardiovascular System: the Heart

In a normal electrocardiogram, the

Correct AnswerverifiedShow Answer

Which statement correctly identifies the phase of the cardiac cycle that occurs when the pressure in the ventricles is lower than the pressure in the great arteries but greater than the pressure in the atria?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

When the aortic semilunar valve closes and blood bounces off of it, it produces the ________ heart sound that is ultimately related to when the ________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The dicrotic notch in the aortic pressure curve is due to the

Correct AnswerverifiedShow Answer

Which vessels empty blood into the left atrium?

Correct AnswerverifiedShow Answer

The product of the stroke volume times the heart rate is known as the

Correct AnswerverifiedShow Answer

A stab wound into the heart can result in cardiac tamponade. This means that

Correct AnswerverifiedShow Answer

The ________ carry blood toward the lungs.

Correct AnswerverifiedShow Answer

The ________ valve guards the entrance to the ________, which carries ________ blood to the lungs.

Correct AnswerverifiedShow Answer

The cardioregulatory center of the brain is located in the

Correct AnswerverifiedShow Answer

Obstruction of the ________ will cause a more severe myocardial infarction (MI) than the obstruction of any of the others.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Most of the ventricle filling occurs ________.

Correct AnswerverifiedShow Answer

When comparing cardiac muscle cells and skeletal muscle cells,

Correct AnswerverifiedShow Answer

All of the following characteristics of the sarcoplasmic reticulum in cardiac muscle cells are true except

Correct AnswerverifiedShow Answer

Assume that the left ventricle of a child's heart has an EDV=90mL, and ESV=60mL, and a cardiac output of 2,400 mL/min. His SV is ________ mL/beat, and his HR is ________ bpm.

Correct AnswerverifiedShow Answer

When sodium channels are fully open, the membrane of the ventricular cardiac muscle cells ________.

Correct AnswerverifiedShow Answer

Energy for contraction of cardiac muscle cells comes primarily from

Correct AnswerverifiedShow Answer

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When the aortic semilunar valve closes and blood bounces off of it, it produces the heart sound that is ultimately related to when the .

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The valve guards the entrance to the , which carries blood to the lungs.

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Assume that the left ventricle of a child's heart has an EDV=90mL, and ESV=60mL, and a cardiac output of 2,400 mL/min. His SV is mL/beat, and his HR is bpm.

Correct Answer
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