Question 1

Conduction through which of the following is slow to allow atria to contract before the ventricles?

Accepted Answer

A)   AV bundle (bundle of His) 
B)   AV node
C)   atria
D)   SA node
E)   Purkinje fibersF) C) and D)
G) None of the above

Question 2

What causes the sounds that one hears as the heart beats?

Accepted Answer

A)   the turbulence created as the valves close
B)   the turbulence created as the valves open
C)   the bulk movement of blood into and out of the ventricle
D)   the snapping of the valves into the open position
E)   the snapping of the valves into a closed positionF) B) and D)
G) A) and B)

Question 3

What phase of the cardiac cycle is the heart in when all four valves of the heart are closed and ventricular pressure is building, but is not yet great enough to open a valve?

Accepted Answer

A)   ventricular filling
B)   isovolumetric relaxation
C)   isovolumetric contraction
D)   ventricular ejection
E)   noneF) A) and B)
G) B) and E)

Question 4

What component of the conduction pathway transmits the action potential to the ventricular contractile cells?

Accepted Answer

A)   nodal pathways
B)   SA node
C)   Purkinje fibers
D)   AV node
E)   bundle of HisF) C) and D)
G) A) and B)

Question 5

Which of the following components of an ECG represents atrial depolarization?

Accepted Answer

A)   P wave
B)   QRS complex
C)   T wave
D)   PQ interval
E)   TQ segmentF) A) and E)
G) A) and D)

Question 6

During recording of an ECG, a depolarization that travels toward a positive lead will cause an upward deflection.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following structures is poorly innervated by the parasympathetic nervous system and, therefore, an increase in parasympathetic activity has little effect on this structure?

Accepted Answer

A)   atrioventricular node
B)   sinoatrial node
C)   ventricles
D)   conduction pathway
E)   Purkinje fibersF) None of the above
G) All of the above

Question 8

Opening of what channels is responsible for the depolarization phase of the cardiac contractile cell action potential?

Accepted Answer

A)   potassium channels
B)   T -type calcium channels
C)   funny channels
D)   L -type calcium channels
E)   voltage -gated sodium channelsF) C) and D)
G) C) and E)

Question 9

Given a constant pressure, the greater the radius of the vessel, the greater the tension on the vessel walls.

Accepted Answer

A) True 
 B)False

Question 10

Starling curves plot________ against ________.

Accepted Answer

A)   stroke volume : end -systolic volume
B)   heart rate : end -systolic volume
C)   stroke volume : end -diastolic volume
D)   cardiac output : end -diastolic volume
E)   heart rate : end -diastolic volumeF) D) and E)
G) C) and D)

Question 11

Prolapse involves improper alignment of the atrioventricular valve such that one or more of the cusps are pushed into the atrium by the pressure developed in the ventricle.

Accepted Answer

A) True 
 B)False

Question 12

Which statement best describes why clinicians use a defibrillator?

Accepted Answer

A)   The ventricles of the heart are so large that only a strong current can make them depolarize, which is needed in order for them to contract and get blood to the body.
B)   The applied current opens up voltage gated calcium channels in the atria causing the heart to begin a new P wave.
C)   The applied current depolarizes all the muscle cells at the same time, returning synchronous electrical activity to the heart.
D)   A defibrillator takes the place of the SA node and must be applied every minute to keep the heart rate normal until it regains its strength and beats on its own.
E)   The applied current repolarizes the cells of the heart, hence resetting the heart for normal rhythm.F) B) and E)
G) A) and B)

Question 13

Cardiac output is in part determined by changes in stroke volume. Identify the factors involved in the determination of stroke volume.

Accepted Answer

Cardiac output is determined by the prod...

Question 14

Which component of an ECG represents ventricular depolarization?

Accepted Answer

A)   P wave
B)   P -R interval
C)   T wave
D)   Q -T interval
E)   QRS complexF) B) and D)
G) A) and D)

Question 15

The preload is approximately the same as the________pressure.

Accepted Answer

A)   aortic systolic
B)   end -diastolic
C)   atrial
D)   end -systolic
E)   aortic diastolicF) A) and D)
G) All of the above

Question 16

If damage to the AV node slowed down conduction through this tissue, what would be observed on an ECG?

Accepted Answer

A)   a longer P wave
B)   a larger P wave
C)   an inverted T wave
D)   a wider QRS complex
E)   a longer PR intervalF) C) and D)
G) A) and E)

Question 17

John has aged gracefully now at the age of 75 with distinguished gray hair and beard, unfortunately his SA node has failed and his heart rate is down to 40 beats per minute. An ECG shows bradycardia and his stroke volume is calculated to be 80 mL. John is short of breath and has low blood pressure and is feeling quite unwell. John's brother Jim is 78 years old and was a triathlete for many years and still swims and bikes five days a week. Jim's resting heart rate is 50 beats per minute and he feels great. His stroke volume has been calculated to be 120 mL per beat. Calculate the cardiac output for both John and Jim and explain why Jim feels so much better than
John.

Accepted Answer

CO = SV × HR. John's CO = 80 × 40 = 3200...

Question 18

Which component of an ECG represents atrial depolarization?

Accepted Answer

A)   P wave
B)   P -R interval
C)   T wave
D)   Q -T interval
E)   QRS complexF) A) and E)
G) A) and B)

Question 19

When blood moves through the body it travels in a circular pattern. The general pattern of blood flow follows which sequence of vessels as it leaves the heart?

Accepted Answer

A)   arterioles, arteries, capillaries, venules, veins
B)   veins, venules, capillaries, arterioles, arteries
C)   arteries, veins, venules, arterioles, capillaries
D)   veins, capillaries, venules, arterioles, arteries
E)   arteries, arterioles, capillaries, venules, veinsF) A) and B)
G) A) and C)

Question 20

The opening and closure of the atrioventricular and semilunar valves is driven by

Accepted Answer

A)   differences in pressure across the valve.
B)   contraction of the valve.
C)   contraction of the ventricle and atria that pull the valves into place.
D)   contraction and relaxation of the valve.
E)   contraction of muscles attached to the valves.F) A) and D)
G) All of the above

Exam 13: The Cardiovascular System: Cardiac Function

What component of the conduction pathway transmits the action potential to the ventricular contractile cells?

Correct Answer
verified

Conduction through which of the following is slow to allow atria to contract before the ventricles?

Correct Answer
verified

Correct Answer
verified
CO = SV × HR. John's CO = 80 × 40 = 3200...
View Answer

What phase of the cardiac cycle is the heart in when all four valves of the heart are closed and ventricular pressure is building, but is not yet great enough to open a valve?

Correct Answer
verified

Which of the following components of an ECG represents atrial depolarization?

Correct Answer
verified

The opening and closure of the atrioventricular and semilunar valves is driven by

Correct Answer
verified

Opening of what channels is responsible for the depolarization phase of the cardiac contractile cell action potential?

Correct Answer
verified

Which of the following structures is poorly innervated by the parasympathetic nervous system and, therefore, an increase in parasympathetic activity has little effect on this structure?

Correct Answer
verified

During recording of an ECG, a depolarization that travels toward a positive lead will cause an upward deflection.

Correct Answer
verified

Which component of an ECG represents ventricular depolarization?

Correct Answer
verified

If damage to the AV node slowed down conduction through this tissue, what would be observed on an ECG?

Correct Answer
verified

Starling curves plot against .

Correct Answer
verified

Given a constant pressure, the greater the radius of the vessel, the greater the tension on the vessel walls.

Correct Answer
verified

Cardiac output is in part determined by changes in stroke volume. Identify the factors involved in the determination of stroke volume.

Correct Answer
verified
Cardiac output is determined by the prod...
View Answer

What causes the sounds that one hears as the heart beats?

Correct Answer
verified

Which component of an ECG represents atrial depolarization?

Correct Answer
verified

Which statement best describes why clinicians use a defibrillator?

Correct Answer
verified

Prolapse involves improper alignment of the atrioventricular valve such that one or more of the cusps are pushed into the atrium by the pressure developed in the ventricle.

Correct Answer
verified

The preload is approximately the same as the________pressure.

Correct Answer
verified

When blood moves through the body it travels in a circular pattern. The general pattern of blood flow follows which sequence of vessels as it leaves the heart?

Correct Answer
verified

Exam 13: The Cardiovascular System: Cardiac Function

What component of the conduction pathway transmits the action potential to the ventricular contractile cells?

Correct AnswerverifiedShow Answer

Conduction through which of the following is slow to allow atria to contract before the ventricles?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedCO = SV × HR. John's CO = 80 × 40 = 3200...View AnswerShow Answer

What phase of the cardiac cycle is the heart in when all four valves of the heart are closed and ventricular pressure is building, but is not yet great enough to open a valve?

Correct AnswerverifiedShow Answer

Which of the following components of an ECG represents atrial depolarization?

Correct AnswerverifiedShow Answer

The opening and closure of the atrioventricular and semilunar valves is driven by

Correct AnswerverifiedShow Answer

Opening of what channels is responsible for the depolarization phase of the cardiac contractile cell action potential?

Correct AnswerverifiedShow Answer

Which of the following structures is poorly innervated by the parasympathetic nervous system and, therefore, an increase in parasympathetic activity has little effect on this structure?

Correct AnswerverifiedShow Answer

During recording of an ECG, a depolarization that travels toward a positive lead will cause an upward deflection.

Correct AnswerverifiedShow Answer

Which component of an ECG represents ventricular depolarization?

Correct AnswerverifiedShow Answer

If damage to the AV node slowed down conduction through this tissue, what would be observed on an ECG?

Correct AnswerverifiedShow Answer

Starling curves plot________ against ________.

Correct AnswerverifiedShow Answer

Given a constant pressure, the greater the radius of the vessel, the greater the tension on the vessel walls.

Correct AnswerverifiedShow Answer

Cardiac output is in part determined by changes in stroke volume. Identify the factors involved in the determination of stroke volume.

Correct AnswerverifiedCardiac output is determined by the prod...View AnswerShow Answer

What causes the sounds that one hears as the heart beats?

Correct AnswerverifiedShow Answer

Which component of an ECG represents atrial depolarization?

Correct AnswerverifiedShow Answer

Which statement best describes why clinicians use a defibrillator?

Correct AnswerverifiedShow Answer

Prolapse involves improper alignment of the atrioventricular valve such that one or more of the cusps are pushed into the atrium by the pressure developed in the ventricle.

Correct AnswerverifiedShow Answer

The preload is approximately the same as the________pressure.

Correct AnswerverifiedShow Answer

When blood moves through the body it travels in a circular pattern. The general pattern of blood flow follows which sequence of vessels as it leaves the heart?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
CO = SV × HR. John's CO = 80 × 40 = 3200...
View 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

Starling curves plot against .

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Cardiac output is determined by the prod...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified