Question 1

Which of the following components of an ECG represents ventricular repolarization?

Accepted Answer

A)  P wave
B)  QRS complex
C)  T wave
D)  PQ interval
E)  TQ segment

Question 2

A heart attack is also known as myocardial ischemia.

Accepted Answer

A) True 
 B)False

Question 3

On average, women have anatomically larger hearts than men.

Accepted Answer

A) True 
 B)False

Question 4

What structure provides the pathway for the movement of electrical current between the cells of the conduction pathway and the ventricular muscle fibers?

Accepted Answer

A)  funny channels
B)  desmosomes
C)  potassium channels
D)  sodium channels
E)  gap junctions

Question 5

The mitral valve separates what chamber from its associated ventricle?

Accepted Answer

A)  right atrium
B)  left ventricle
C)  left atrium
D)  right ventricle
E)  AV bundle (bundle of His)

Question 6

An abnormally slow firing of the SA node causes bradycardia.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following is an effect of parasympathetic activity to the heart?

Accepted Answer

A)  cAMP is activated.
B)  Heart rate is increased.
C)  Postganglionic neurons release acetylcholine, which binds to nicotinic cholinergic receptors in the SA node.
D)  SA nodal cells are depolarized.
E)  The rate of spontaneous depolarization in SA nodal cells decreases.

Question 8

What is the function of the sodium- calcium exchanger in cardiac muscle?

Accepted Answer

A)  depolarize the cell
B)  remove calcium from the cytosol by transporting it to the extracellular fluid thereby relaxing the muscle
C)  trigger the release of calcium from the sarcoplasmic reticulum
D)  interact with troponin to initiate cross- bridge cycling
E)  remove calcium from the cytosol by transporting it into the sarcoplasmic reticulum

Question 9

Keeping blood on the left side of the heart from mixing with the blood on the right side is a function of what structure(s) ?

Accepted Answer

A)  chordae tendineae
B)  arteries
C)  apex
D)  septum
E)  valves

Question 10

The initial depolarization that occurs in pacemaker cells is caused by closing of channels and opening of channels.

Accepted Answer

A)  sodium : T- type calcium
B)  potassium : T- type calcium
C)  potassium : funny
D)  sodium : funny
E)  sodium : L- type calcium

Question 11

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)  Purkinje fibers
B)  sinoatrial node
C)  ventricles
D)  atrioventricular node
E)  conduction pathway

Question 12

Describe the structures of the heart that are responsible for regulating the movement of blood from one chamber to the next.

Accepted Answer

The heart is a unique structure containi...

Question 13

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 14

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

Accepted Answer

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

Question 15

The T- Q segment is the time from the end of the T wave to the beginning of the QRS complex which measures the time

Accepted Answer

A)  between heartbeats.
B)  of ventricular systole.
C)  of ventricular diastole.
D)  of atrial diastole.
E)  of atrial systole.

Question 16

Which chamber is connected to the pulmonary arteries?

Accepted Answer

A)  right atrium
B)  left ventricle
C)  left atrium
D)  right ventricle
E)  AV bundle (bundle of His)

Question 17

Ion channels within the conduction system of the heart determine the frequency of contractile cycles generated by the heart. Describe the autorhythmic properties of the heart, with particular emphasis on the ion channels involved in the pacemaker potentials.

Accepted Answer

The pacemaker cells of the heart are inv...

Question 18

Closure of the atrioventricular valve occurs when

Accepted Answer

A)  the papillary muscle contracts.
B)  the valve contracts.
C)  the atrium contracts.
D)  pressure inside the ventricle is less than pressure inside the atrium.
E)  pressure inside the ventricle is greater than pressure inside the atrium.

Question 19

An increase in venous return would result in a(n)

Accepted Answer

A)  increased end- diastolic volume.
B)  decreased end- systolic volume.
C)  increased end- systolic volume.
D)  increase mid- systolic volume.
E)  decreased end- diastolic volume.

Question 20

Which of the following statements best describes the function of the chordae tendineae?

Accepted Answer

A)  The chordae tendineae act like a parachute and capture blood as it enters the right ventricle.
B)  They pull downward on the valve cusps, thereby preventing the AV valves from being pushed into the atria (prolapsing) .
C)  The chordae tendineae generate autorhythmicity within the heart.
D)  They open and close the AV valve due to the movement of the papillary muscle during contraction.
E)  When the heart contracts, the chordate tendineae separate the flow of blood from the right and left sides of the heart.

Exam 13: The Cardiovascular System: Cardiac Function

The T- Q segment is the time from the end of the T wave to the beginning of the QRS complex which measures the time

Correct AnswerverifiedShow Answer

What structure provides the pathway for the movement of electrical current between the cells of the conduction pathway and the ventricular muscle fibers?

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

What is the function of the sodium- calcium exchanger in cardiac muscle?

Correct AnswerverifiedShow Answer

On average, women have anatomically larger hearts than men.

Correct AnswerverifiedShow Answer

Which of the following statements best describes the function of the chordae tendineae?

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

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

Correct AnswerverifiedShow Answer

The mitral valve separates what chamber from its associated ventricle?

Correct AnswerverifiedShow Answer

Which chamber is connected to the pulmonary arteries?

Correct AnswerverifiedShow Answer

A heart attack is also known as myocardial ischemia.

Correct AnswerverifiedShow Answer

Describe the structures of the heart that are responsible for regulating the movement of blood from one chamber to the next.

Correct AnswerverifiedThe heart is a unique structure containi...View AnswerShow Answer

Which of the following components of an ECG represents ventricular repolarization?

Correct AnswerverifiedShow Answer

Which of the following is an effect of parasympathetic activity to the heart?

Correct AnswerverifiedShow Answer

The initial depolarization that occurs in pacemaker cells is caused by closing of channels and opening of channels.

Correct AnswerverifiedShow Answer

Ion channels within the conduction system of the heart determine the frequency of contractile cycles generated by the heart. Describe the autorhythmic properties of the heart, with particular emphasis on the ion channels involved in the pacemaker potentials.

Correct AnswerverifiedThe pacemaker cells of the heart are inv...View AnswerShow Answer

An abnormally slow firing of the SA node causes bradycardia.

Correct AnswerverifiedShow Answer

An increase in venous return would result in a(n)

Correct AnswerverifiedShow Answer

Keeping blood on the left side of the heart from mixing with the blood on the right side is a function of what structure(s) ?

Correct AnswerverifiedShow Answer

Closure of the atrioventricular valve occurs when

Correct AnswerverifiedShow Answer

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The heart is a unique structure containi...
View Answer

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The pacemaker cells of the heart are inv...
View Answer

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