Question 1

When left atrial pressure exceeds left ventricular pressure,

Accepted Answer

A)  left ventricular ejection begins.
B)  aortic blood pressure begins to rise.
C)  the bicuspid (mitral) valve opens.
D)  ventricular volume decreases.
E)  the tricuspid valve opens.F) A) and B)
G) All of the above

Question 2

Baroreceptor reflexes

Accepted Answer

A)  are triggered by increased blood osmolality.
B)  correct changes in blood pH.
C)  do not impact the activity of the heart.
D)  are of minor importance in humans.
E)  can change heart rate.F) A) and B)
G) None of the above

Question 3

Identify the structures that contribute to the slow onset of contraction and prolonged contraction phase in cardiac muscle tissue.

Accepted Answer

A)   Desmosomes
B)   Gap junctions
C)   Intercalated discs
D)   T-tubules
E)   Terminal cisternaeF) A) and B)
G) A) and C)

Question 4

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) A) and D)
G) A) and E)

Question 5

During hemorrhagic shock in which blood pressure is decreased,which of the regulatory mechanisms is most important is increasing cardiac output to help maintain blood pressure?

Accepted Answer

A)  increased sympathetic stimulation of the heart
B)  increase venous return
C)  increase in parasympathetic stimulation of the heart
D)  increase vagal stimulation of the heart
E)  increase in the amplitude of the heart soundsF) A) and E)
G) C) and D)

Question 6

Afterload is

Accepted Answer

A)  the name given to an increase in end-diastolic volume.
B)  the arterial pressure that the ventricles must overcome to eject blood.
C)  the amount cardiac output must increase during exercise.
D)  another name for venous return.
E)  the extent to which ventricular walls are stretched.F) All of the above
G) A) and E)

Question 7

The cardiac electrical impulse normally begins spontaneously in the SA node because

Accepted Answer

A)  of the superior location of the SA node in the right atrium.
B)  the SA node is the only area of the heart capable of spontaneous depolarization.
C)  of the rich sympathetic innervation of the SA node.
D)  this area produces action potentials more rapidly than any other portion of the conduction system.
E)  of action potentials from the cardioregulatory center.F) None of the above
G) A) and E)

Question 8

All cardiac veins empty into the _________,which then empties into the _______.

Accepted Answer

A)  coronary sinus; left atrium
B)  coronary sinus; right atrium
C)  great cardiac vein; right atrium
D)  great cardiac vein; superior vena cava
E)  inferior vena cava; left atriumF) A) and E)
G) B) and E)

Question 9

An incompetent mitral valve may cause blood to back up into the

Accepted Answer

A)  aorta.
B)  left atrium.
C)  left ventricle.
D)  coronary circulation.
E)  right atrium.F) A) and E)
G) A) and D)

Question 10

Within normal limits,an increase in preload leads to

Accepted Answer

A)  an increase in cardiac output and force of left ventricular contraction.
B)  a decrease in cardiac output and force of left ventricular contraction.
C)  an increase in cardiac output and a decrease in force of left ventricular contraction.
D)  a decrease in cardiac output and an increase in the force of left ventricular contraction.
E)  a decrease in stroke volume and heart rate.F) A) and B)
G) None of the above

Question 11

The ion primarily responsible for depolarization in pacemaker cells is ______________,whereas the ion primarily responsible for this in other cardiac cells is _____________.

Accepted Answer

A)   sodium; calcium
B)   calcium; sodium
C)   potassium; sodium
D)   calcium; potassiumE) C) and D)
F) None of the above

Question 12

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) B) and C)
G) A) and C)

Question 13

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) All of the above
G) None of the above

Question 14

Action potentials pass from one myocardial cell to another through areas of low electrical resistance called

Accepted Answer

A)  gap junctions.
B)  fibrous heart rings.
C)  electromagnetic discs.
D)  sarcolemma sclerotic plaques.
E)  tight junctions.F) C) and D)
G) B) and E)

Question 15

If cardiac muscle cells are unable to repolarize,this would cause

Accepted Answer

A)  cardiac output to increase.
B)  no harm.These cells can spontaneously depolarize anyway.
C)  the heart rate to decrease.It might cause cardiac arrest.
D)  an increased demand on mitochondria to produce more ATP.
E)  tachycardia.F) B) and D)
G) A) and D)

Question 16

The volume of blood pumped during each cardiac cycle is the

Accepted Answer

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

Question 17

A patient has been diagnosed with mild heart disease.Tests show that some of the coronary arteries are partially occluded.Which of the following is the best course of action to treat the disease?

Accepted Answer

A)   Angioplasty
B)   Coronary bypass surgery
C)   Electrocardiogram
D)   Tissue plasminogen activation
E)   AngiogramF) A) and C)
G) B) and E)

Question 18

The valve located between the right ventricle and the pulmonary trunk is the

Accepted Answer

A)  aortic semilunar valve.
B)  pulmonary semilunar valve.
C)  tricuspid valve.
D)  mitral valve.
E)  bicuspid valve.F) B) and E)
G) A) and E)

Question 19

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 cells.
B)   it is in close association wit the transverse tubules.
C)   it is involved in the storage and release of calcium
D)   it has enlarged terminal cisternae like skeletal muscle cells.E) C) and D)
F) A) and B)

Exam 20: Cardiovascular System: the Heart

The cardiac electrical impulse normally begins spontaneously in the SA node because

Correct Answer
verified

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

Correct Answer
verified

During hemorrhagic shock in which blood pressure is decreased,which of the regulatory mechanisms is most important is increasing cardiac output to help maintain blood pressure?

Correct Answer
verified

The volume of blood pumped during each cardiac cycle is the

Correct Answer
verified

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

Correct Answer
verified

Baroreceptor reflexes

Correct Answer
verified

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

Correct Answer
verified

Identify the structures that contribute to the slow onset of contraction and prolonged contraction phase in cardiac muscle tissue.

Correct Answer
verified

Afterload is

Correct Answer
verified

The ion primarily responsible for depolarization in pacemaker cells is __,whereas the ion primarily responsible for this in other cardiac cells is _.

Correct Answer
verified

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

Correct Answer
verified

Within normal limits,an increase in preload leads to

Correct Answer
verified

The valve located between the right ventricle and the pulmonary trunk is the

Correct Answer
verified

Action potentials pass from one myocardial cell to another through areas of low electrical resistance called

Correct Answer
verified

If cardiac muscle cells are unable to repolarize,this would cause

Correct Answer
verified

A patient has been diagnosed with mild heart disease.Tests show that some of the coronary arteries are partially occluded.Which of the following is the best course of action to treat the disease?

Correct Answer
verified

All cardiac veins empty into the ___,which then empties into the _.

Correct Answer
verified

When left atrial pressure exceeds left ventricular pressure,

Correct Answer
verified

An incompetent mitral valve may cause blood to back up into the

Correct Answer
verified

Exam 20: Cardiovascular System: the Heart

The cardiac electrical impulse normally begins spontaneously in the SA node because

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

During hemorrhagic shock in which blood pressure is decreased,which of the regulatory mechanisms is most important is increasing cardiac output to help maintain blood pressure?

Correct AnswerverifiedShow Answer

The volume of blood pumped during each cardiac cycle is the

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Baroreceptor reflexes

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Identify the structures that contribute to the slow onset of contraction and prolonged contraction phase in cardiac muscle tissue.

Correct AnswerverifiedShow Answer

Afterload is

Correct AnswerverifiedShow Answer

The ion primarily responsible for depolarization in pacemaker cells is ______________,whereas the ion primarily responsible for this in other cardiac cells is _____________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Within normal limits,an increase in preload leads to

Correct AnswerverifiedShow Answer

The valve located between the right ventricle and the pulmonary trunk is the

Correct AnswerverifiedShow Answer

Action potentials pass from one myocardial cell to another through areas of low electrical resistance called

Correct AnswerverifiedShow Answer

If cardiac muscle cells are unable to repolarize,this would cause

Correct AnswerverifiedShow Answer

A patient has been diagnosed with mild heart disease.Tests show that some of the coronary arteries are partially occluded.Which of the following is the best course of action to treat the disease?

Correct AnswerverifiedShow Answer

All cardiac veins empty into the _________,which then empties into the _______.

Correct AnswerverifiedShow Answer

When left atrial pressure exceeds left ventricular pressure,

Correct AnswerverifiedShow Answer

An incompetent mitral valve may cause blood to back up into 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

The ion primarily responsible for depolarization in pacemaker cells is __,whereas the ion primarily responsible for this in other cardiac cells is _.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

All cardiac veins empty into the ___,which then empties into the _.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified