Question 1

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 injectionsF) A) and D)
G) None of the above

Question 2

Mean arterial pressure is

Accepted Answer

A)   cardiac output times peripheral resistance.
B)   end-diastolic volume minus end-systolic volume.
C)   maximum cardiac output minus cardiac output when at rest.
D)   heart rate times stroke volume.
E)   stroke volume times peripheral resistance.F) A) and B)
G) B) and E)

Question 3

What action is most responsible for the resting membrane potential in cardiac muscle cells?

Accepted Answer

A)   Movement of K+ through voltage-gated K+ channels
B)   Movement of Na+ through open Na+ channels
C)   Movement of Ca2+ through voltage-gated Ca2+ channels.
D)   Closing of Na+ and K+ voltage-gated channelsE) All of the above
F) C) and D)

Question 4

During isovolumetric contraction, the pressure in the ventricles ________.

Accepted Answer

A)   falls rapidly
B)   rises rapidly
C)   remains constant
D)   rises and then falls
E)   falls and then risesF) A) and C)
G) C) and D)

Question 5

What abnormal heart rhythm could be caused by an elevated body temperature, excessive sympathetic stimulation, or toxic conditions?

Accepted Answer

A)   Bradycardia
B)   Atrial fibrillation
C)   Second-degree AV node block
D)   TachycardiaE) None of the above
F) C) and D)

Question 6

The peripheral chemoreceptors that respond to oxygen levels of the blood and regulate heart activity are located in

Accepted Answer

A)   the left ventricle.
B)   the infundibulum of the hypothalamus.
C)   structures near the carotids and aortic arch.
D)   the medulla oblongata.
E)   the right ventricle.F) A) and B)
G) None of the above

Question 7

All of the following structural changes found in the heart occur with the normal aging process, except

Accepted Answer

A)   hypertrophy of the left ventricle.
B)   decreased elasticity of large vessels.
C)   decreased valve flexibility.
D)   increased elasticity of large vessels.
E)   atrophy of conduction cells.F) B) and D)
G) A) and B)

Question 8

Excess K+ in cardiac tissue causes

Accepted Answer

A)   an increased heart rate.
B)   a rapid repolarization of cardiac cells.
C)   a decrease in the frequency of action potentials in the conduction system.
D)   an increase in stroke volume.
E)   an increase in the frequency of action potentials.F) None of the above
G) A) and E)

Question 9

Blood does not enter or leave the ventricles during the period called

Accepted Answer

A)   ejection.
B)   rapid filling.
C)   atrial systole.
D)   isovolumetric contraction.
E)   active and passive filling.F) C) and D)
G) A) and B)

Question 10

Which of the following blood vessels receives blood directly from the right ventricle?

Accepted Answer

A)   Pulmonary trunk
B)   Ascending aorta
C)   Superior vena cava
D)   Inferior vena cava
E)   Right pulmonary veinF) C) and D)
G) A) and E)

Question 11

Regurgitation of blood flow through the aortic semilunar valve would give rise to

Accepted Answer

A)   the first heart sound.
B)   the second heart sound.
C)   a heart murmur.
D)   an extra heart beat.
E)   end-systolic volume.F) C) and D)
G) B) and C)

Question 12

A direct connection between arteries is called a/an ________.

Accepted Answer

A)   auricle
B)   sulcus
C)   sinus
D)   anastamosisE) C) and D)
F) A) and D)

Question 13

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) B) and C)
G) C) and D)

Question 14

The long absolute refractory period of cardiac muscle cells

Accepted Answer

A)   ensures a short twitch.
B)   prevents tetanus.
C)   makes the heart prone to arrhythmias.
D)   prevents the occurrence of ectopic focuses.
E)   causes the pacemaker potential.F) A) and C)
G) C) and D)

Question 15

Which of the following pairs concerning action potentials in cardiac muscle is mismatched?

Accepted Answer

A)   Opening of Na+ channels - depolarization
B)   Closing of Ca2+ channels - plateau phase
C)   Opening of K+ channels - rapid repolarization
D)   Closure of Na+ channels - early repolarization
E)   Opening of Ca2+ channels - plateau phaseF) B) and C)
G) A) and E)

Question 16

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.F) B) and E)
G) A) and B)

Question 17

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)   UrokinaseE) A) and D)
F) B) and D)

Question 18

Which of the following is NOT a major opening into the right atrium?

Accepted Answer

A)   Pulmonary vein
B)   Inferior vena cava
C)   Superior vena cava
D)   Coronary sinusE) All of the above
F) A) and D)

Question 19

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 cells are slightly stretched, they have a stronger contraction force.
E)   If cardiac muscle cells are slightly stretched, they have a weaker contraction force.F) All of the above
G) C) and D)

Question 20

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.F) D) and E)
G) C) and D)

Exam 20: Cardiovascular System: the Heart

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

Correct AnswerverifiedShow Answer

Which of the following is NOT a major opening into the right atrium?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The peripheral chemoreceptors that respond to oxygen levels of the blood and regulate heart activity are located in

Correct AnswerverifiedShow Answer

What abnormal heart rhythm could be caused by an elevated body temperature, excessive sympathetic stimulation, or toxic conditions?

Correct AnswerverifiedShow Answer

Regurgitation of blood flow through the aortic semilunar valve would give rise to

Correct AnswerverifiedShow Answer

Which of the following pairs concerning action potentials in cardiac muscle is mismatched?

Correct AnswerverifiedShow Answer

All of the following structural changes found in the heart occur with the normal aging process, except

Correct AnswerverifiedShow Answer

Blood does not enter or leave the ventricles during the period called

Correct AnswerverifiedShow Answer

During isovolumetric contraction, the pressure in the ventricles ________.

Correct AnswerverifiedShow Answer

Excess K+ in cardiac tissue causes

Correct AnswerverifiedShow Answer

A direct connection between arteries is called a/an ________.

Correct AnswerverifiedShow Answer

What action is most responsible for the resting membrane potential in cardiac muscle cells?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The long absolute refractory period of cardiac muscle cells

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

Mean arterial pressure is

Correct AnswerverifiedShow Answer

Which of the following blood vessels receives blood directly from the right ventricle?

Correct AnswerverifiedShow Answer

Chemoreceptors sensitive to blood oxygen levels are primarily located in the

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Excess K⁺ in cardiac tissue causes

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified