Question 1

Match the description with the corresponding terms.
-Poiseuille law

Accepted Answer

A)  Relationship among blood flow, pressure, and resistance
B)  Increased heart rate from increased volume
C)  Relationship of wall tension, intraventricular pressure, internal radius, and wall thickness
D)  Cycles of attachment, movement, and dissociation of thin filaments during the attachments of actin to myosin
E)  Length-tension relationship of cardiac muscleF) A) and B)
G) A) and E)

Question 2

What is the process that ensures mitral and tricuspid valve closure after the ventricles are filled with blood?

Accepted Answer

A)   Chordae tendineae relax, which allows the valves to close.
B)   Increased pressure in the ventricles pushes the valves to close.
C)   Trabeculae carneae contract, which pulls the valves closed.
D)   Reduced pressure in the atria creates a negative pressure that pulls the valves closed.E) None of the above
F) A) and C)

Question 3

Where in the heart are the receptors for neurotransmitters located?

Accepted Answer

A)   Semilunar and atrioventricular (AV)  valves
B)   Endocardium and sinoatrial (S
A)   node
C)   Myocardium and coronary vessels
D)   Epicardium and AV nodeE) C) and D)
F) B) and C)

Question 4

Regarding the heart's valves,what is a function of the papillary muscles?

Accepted Answer

A)   The papillary muscles close the semilunar valve.
B)   These muscles prevent backward expulsion of the atrioventricular valve.
C)   They close the atrioventricular valve.
D)   The papillary muscles open the semilunar valve.E) All of the above
F) None of the above

Question 5

During the cardiac cycle,why do the aortic and pulmonic valves close after the ventricles relax?

Accepted Answer

A)   Papillary muscles relax, which allows the valves to close.
B)   Chordae tendineae contract, which pulls the valves closed.
C)   Reduced pressure in the ventricles creates a negative pressure, which pulls the valves closed.
D)   Blood fills the cusps of the valves and causes the edges to merge, closing the valves.E) All of the above
F) B) and D) D

Question 6

Match the description with the corresponding terms.
-Frank-Starling law

Accepted Answer

A)  Relationship among blood flow, pressure, and resistance
B)  Increased heart rate from increased volume
C)  Relationship of wall tension, intraventricular pressure, internal radius, and wall thickness
D)  Cycles of attachment, movement, and dissociation of thin filaments during the attachments of actin to myosin
E)  Length-tension relationship of cardiac muscleF) None of the above
G) B) and D)

Question 7

Where is the major cardiovascular center in the central nervous system?

Accepted Answer

A)   Frontal lobe
B)   Thalamus
C)   Brainstem
D)   HypothalamusE) A) and B)
F) A) and C)

Question 8

Occlusion of the circumflex artery during a myocardial infarction would interrupt blood supply to which area?

Accepted Answer

A)   Left and right ventricles and much of the interventricular septum
B)   Posterior interventricular sulcus and the smaller branches of both ventricles
C)   Upper right ventricle, right marginal branch, and right ventricle to the apex
D)   Left atrium and the lateral wall of the left ventricleE) All of the above
F) B) and C)

Question 9

During the cardiac cycle,which structure directly delivers action potential to the ventricular myocardium?

Accepted Answer

A)   Sinoatrial (S
A)   node
B)   Atrioventricular (AV)  node
C)   Purkinje fibers
D)   Bundle branchesE) A) and B)
F) A) and C) C

Question 10

Pressure in the left ventricle must exceed pressure in which structure before the left ventricle can eject blood?

Accepted Answer

A)   Superior vena cava
B)   Aorta
C)   Inferior vena cava
D)   Pulmonary veinsE) B) and D)
F) All of the above B

Question 11

What can shorten the conduction time of action potential through the atrioventricular (AV) node?

Accepted Answer

A)   Parasympathetic nervous system
B)   Catecholamines
C)   Vagal stimulation
D)   Sinoatrial node (S
A)  E) B) and D)
F) B) and C)

Question 12

Which statement does not accurately describe the pericardium?

Accepted Answer

A)   The pericardium is a double-walled membranous sac that encloses the heart.
B)   It is made up of connective tissue and a surface layer of squamous cells.
C)   The pericardium protects the heart against infection and inflammation from the lungs and pleural space.
D)   It contains pain and mechanoreceptors that can elicit reflex changes in blood pressure and heart rate.E) A) and D)
F) None of the above

Question 13

When the volume of blood in the ventricle at the end of diastole increases,the force of the myocardial contraction during the next systole will also increase,which is an example of which law or theory about the heart?

Accepted Answer

A)   Laplace's law
B)   Poiseuille law
C)   Cross-bridge theory
D)   Frank-Starling lawE) A) and B)
F) A) and C)

Question 14

If the sinoatrial (SA) node fails,then at what rate (depolarizations per minute) can the atrioventricular (AV) node depolarize?

Accepted Answer

A)   60 to 70
B)   40 to 60
C)   30 to 40
D)   10 to 20E) A) and B)
F) None of the above

Question 15

Reflex control of total cardiac output and total peripheral resistance is controlled by what mechanism?

Accepted Answer

A)   Parasympathetic stimulation of the heart, arterioles, and veins
B)   Sympathetic stimulation of the heart, arterioles, and veins
C)   Autonomic control of the heart only
D)   Somatic control of the heart, arterioles, and veinsE) None of the above
F) A) and D)

Question 16

An early diastole peak caused by filling of the atrium from peripheral veins is identified by which intracardiac pressure?

Accepted Answer

A)   A wave
B)   V wave
C)   C wave
D)   X descentE) A) and B)
F) A) and C)

Question 17

Which statements are true concerning the method in which substances pass between capillaries and the interstitial fluid? (Select all that apply.)

Accepted Answer

A)   Substances pass through junctions between endothelial cells.
B)   Substances pass through pores or oval windows (fenestrations) .
C)   Substances pass between vesicles by active transport across the endothelial cell membrane.
D)   Substances pass across the endothelial cell membrane by osmosis.
E)   Substances pass through endothelial cell membranes by diffusion.F) B) and D)
G) A) and B)

Question 18

Occlusion of the left anterior descending artery during a myocardial infarction would interrupt blood supply to which structures?

Accepted Answer

A)   Left and right ventricles and much of the interventricular septum
B)   Left atrium and the lateral wall of the left ventricle
C)   Upper right ventricle, right marginal branch, and right ventricle to the apex
D)   Posterior interventricular sulcus and the smaller branches of both ventriclesE) All of the above
F) A) and C)

Question 19

What is the most important negative inotropic agent?

Accepted Answer

A)   Norepinephrine
B)   Epinephrine
C)   Acetylcholine
D)   DopamineE) A) and C)
F) None of the above

Question 20

Within a physiologic range,what does an increase in left ventricular end-diastolic volume (preload) result in?

Accepted Answer

A)   Increase in force of contraction
B)   Decrease in refractory time
C)   Increase in afterload
D)   Decrease in repolarizationE) B) and D)
F) None of the above

Exam 31: Structure and Function of the Cardiovascular and Lymphatic Systems

Match the description with the corresponding terms. -Poiseuille law

Correct AnswerverifiedShow Answer

What is the process that ensures mitral and tricuspid valve closure after the ventricles are filled with blood?

Correct AnswerverifiedShow Answer

Where in the heart are the receptors for neurotransmitters located?

Correct AnswerverifiedShow Answer

Regarding the heart's valves,what is a function of the papillary muscles?

Correct AnswerverifiedShow Answer

During the cardiac cycle,why do the aortic and pulmonic valves close after the ventricles relax?

Correct AnswerverifiedD

Match the description with the corresponding terms. -Frank-Starling law

Correct AnswerverifiedShow Answer

Where is the major cardiovascular center in the central nervous system?

Correct AnswerverifiedShow Answer

Occlusion of the circumflex artery during a myocardial infarction would interrupt blood supply to which area?

Correct AnswerverifiedShow Answer

During the cardiac cycle,which structure directly delivers action potential to the ventricular myocardium?

Correct AnswerverifiedC

Pressure in the left ventricle must exceed pressure in which structure before the left ventricle can eject blood?

Correct AnswerverifiedB

What can shorten the conduction time of action potential through the atrioventricular (AV) node?

Correct AnswerverifiedShow Answer

Which statement does not accurately describe the pericardium?

Correct AnswerverifiedShow Answer

When the volume of blood in the ventricle at the end of diastole increases,the force of the myocardial contraction during the next systole will also increase,which is an example of which law or theory about the heart?

Correct AnswerverifiedShow Answer

If the sinoatrial (SA) node fails,then at what rate (depolarizations per minute) can the atrioventricular (AV) node depolarize?

Correct AnswerverifiedShow Answer

Reflex control of total cardiac output and total peripheral resistance is controlled by what mechanism?

Correct AnswerverifiedShow Answer

An early diastole peak caused by filling of the atrium from peripheral veins is identified by which intracardiac pressure?

Correct AnswerverifiedShow Answer

Which statements are true concerning the method in which substances pass between capillaries and the interstitial fluid? (Select all that apply.)

Correct AnswerverifiedShow Answer

Occlusion of the left anterior descending artery during a myocardial infarction would interrupt blood supply to which structures?

Correct AnswerverifiedShow Answer

What is the most important negative inotropic agent?

Correct AnswerverifiedShow Answer

Within a physiologic range,what does an increase in left ventricular end-diastolic volume (preload) result in?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
D

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
C

Correct Answer
verified
B

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