Deck 17: Function of the Heart

Question 1

Excess vagal stimulation to the SA node is most likely to cause

A)hypertension.
B)bradycardia.
C)tachycardia.
D)anemia.

Answer 1

bradycardia.

Question 2

Systole and diastole describe the function of the

A)pericardium.
B)SA node.
C)myocardium.
D)mediastinum.

Answer 2

myocardium.

Question 3

Which of the following is descriptive of the vagus nerve?

A)Fight-or-flight
B)Parasympathetic
C)Sympathetic
D)Adrenergic

Answer 3

Parasympathetic

Question 4

Which of the following does not happen to a ventricle?

A)Activation of the Beta₁-adrenergic receptors
B)Discharge of sympathetic nerves
C)Discharge of the vagal nerve
D)Binding of norepinephrine to its receptor

Question 5

Vagal stimulation to the heart causes

A)a (+) inotropic effect.
B)heart rate to slow.
C)cardiac output to increase.
D)stroke volume to increase.

Question 6

Which term refers to the amount of blood pumped by the heart in 1 minute?

A)Stroke volume
B)Cardiac output
C)Starling's law of the heart
D)Inotropic effect

Question 7

Decreased blood flow through the coronary arteries is most likely to cause

A)valve damage.
B)pulmonary edema.
C)angina pectoris.
D)bradycardia.

Question 8

Which of the following is responsible for the Starling effect?

A)Sympathetic nerve firing
B)Vagal discharge
C)Activation of the Beta₁-adrenergic receptors
D)End-diastolic volume (EDV) or preload

Question 9

During atrial systole,the

A)AV valves are closed.
B)ventricles are relaxed.
C)ventricles are in systole.
D)semilunar valves are open.

Question 10

Which of the following is most likely to increase ejection fraction?

A)Activation of Beta₁-adrenergic receptors
B)Vagal discharge
C)Blockade of Beta₁-adrenergic receptors
D)Activation of the muscarinic receptors

Question 11

Which of the following is the same as end-diastolic volume?

A)Stroke volume
B)Cardiac output
C)Preload
D)Cardiac reserve

Question 12

Heart rate and stroke volume determine

A)hematocrit.
B)total blood volume.
C)cardiac output.
D)the size of the heart valves.

Question 13

Which of the following is most likely to relieve an anxiety-induced tachycardia?

A)Vagolytic drug
B)Beta₁-adrenergic agonist
C)Sympathomimetic
D)Beta₁-adrenergic blocker

Question 14

Activation of the muscarinic receptors by acetylcholine

A)increases myocardial contractile force.
B)causes a (+) chronotropic effect.
C)increases cardiac output.
D)slows heart rate.

Question 15

What term refers to the amount of blood pumped by the ventricle in one beat?

A)Cardiac output
B)Blood volume
C)Hematocrit
D)Stroke volume

Question 16

Sympathetic nerve stimulation of the myocardium

A)causes a (+) inotropic effect.
B)decreases cardiac output.
C)decreases heart rate.
D)decreases stroke volume.

Question 17

A drug (e.g. ,atropine) that blocks the effects of the vagus nerve

A)stops the heart.
B)increases heart rate.
C)decreases cardiac output.
D)decreases stroke volume.

Question 18

What happens during ventricular diastole?

A)The ventricles are filling with blood.
B)All semilunar valves are open.
C)Both AV valves are closed.
D)Blood is pumped to the lungs and systemic circulation.

Question 19

Which of the following is most likely to increase stroke volume?

A)A (+) inotropic drug
B)A vagolytic drug
C)A (-) chronotropic drug
D)A Beta₁-adrenergic blocker

Question 20

Which of the following is the most likely consequence of a very rapid heart rate?

A)Decreased ventricular filling (with blood)
B)Failure of the AV valves to open
C)Failure of the SA node to fire
D)Failure of the cardiac impulse to enter the His-Purkinje system

Question 21

Increased afterload (e.g. ,hypertension)

A)is usually caused by arteriolar dilation.
B)increases the work of the heart.
C)can only occur when preload increases.
D)is usually caused by intense parasympathetic (vagal) discharge.

Question 22

An ejection fraction of 30% is

A)normal.
B)characteristic of a healthy person who is engaged in aerobic exercise.
C)characteristic of a failing heart.
D)the amount of oxygenated hemoglobin in the blood in the left ventricle.

Question 23

Which of the following most accurately describes the vagus nerve?

A)Fight or flight
B)Norepinephrine
C)Parasympathetic
D)Causes tachycardia

Question 24

Vagal stimulation on the heart

A)increases the force of myocardial contraction.
B)increases the amount of blood that flows into the heart from the vena cava.
C)causes tachycardia.
D)slows the heart rate.

Question 25

Which of the following is approximately 70 mL?

A)The cardiac output
B)The volume of a ventricle
C)An average stroke volume
D)The amount of blood that flows through the pulmonary capillaries in one minute

Question 26

Which of the following is descriptive of a drug that causes a (+) inotropic effect,a (+) dromotropic effect,and a (+) chronotropic effect?

A)Vagomimetic
B)Sympathomimetic
C)Antimuscarinic
D)Vagolytic

Question 27

Which of the following refers to a positive inotropic effect?

A)Heart block
B)A slow heart rate
C)A rapid heartbeat
D)An increased myocardial contractile force

Question 28

Sympathetic stimulation to the heart

A)decreases stroke volume.
B)increases heart rate.
C)causes bradycardia.
D)decreases cardiac output.

Question 29

Most of the symptoms of acute left-sided heart failure are

A)relieved by morphine.
B)cured by an antibiotic.
C)respiratory in nature (e.g. ,dyspnea,orthopnea).
D)confined to the lower extremities,as in pedal edema.

Question 30

A stenotic aortic valve

A)causes right ventricular hypertrophy and right-sided heart failure.
B)increases afterload,thereby increasing the work of the left ventricle.
C)causes a right-to-left shunt.
D)is a narrowing of the right semilunar valve.

Question 31

Atropine is a muscarinic antagonist and is therefore used to

A)relieve bradycardia.
B)decrease heart rate.
C)block the effects of norepinephrine.
D)increase myocardial contractile force.

Question 32

What is the term for the sequence of events that occur during one heartbeat?

A)Stroke volume
B)Cardiac output
C)Cardiac cycle
D)Systole

Question 33

An increased preload

A)decreases cardiac output.
B)increases stroke volume.
C)increases cardiac reserve.
D)increases afterload.

Question 34

Which term refers to a heart rate less than 60 beats/min?

A)Bradycardia
B)Heart block
C)Fight-or-flight response
D)Tachycardia

Question 35

Increased return of the blood to the heart stretches the muscle,thereby

A)stimulating the sympathetic nerve.
B)activating the Beta₁-adrenergic receptors.
C)closing the AV valves.
D)increasing stroke volume.

Question 36

Cardiac output

A)is determined by heart rate and pulse.
B)decreases in response to sympathetic nerve stimulation.
C)increases in response to vagal discharge.
D)is determined by heart rate and stroke volume.

Question 37

Which of the following drugs is sympathomimetic?

A)Beta₁-adrenergic blocker
B)Muscarinic agonist
C)Vagolytic
D)Beta₁-adrenergic agonist

Question 38

Which of the following is the most likely consequence of acute left ventricular failure?

A)Jugular vein distention
B)Hepatomegaly and splenomegaly
C)Pulmonary edema
D)Pedal edema

Question 39

Cardiac output is determined by heart rate and

A)systemic vascular resistance.
B)stroke volume.
C)hematocrit.
D)hemoglobin concentration.

Question 40

What is the term that refers to an increase in stroke volume in response to the stretching of the heart?

A)Starling's law of the heart
B)A positive inotropic effect
C)Heart block
D)Angina pectoris

Question 41

Atropine,a muscarinic blocker,

A)increases heart rate.
B)causes bradycardia.
C)is also classified as sympathomimetic.
D)is vagomimetic.

Question 42

An increase in venous return causes an increase in cardiac output.This is accomplished by

A)a (+) inotropic effect.
B)depolarization.
C)Starling's law of the heart.
D)a (+) chronotropic effect.

Question 43

Which of the following is least related to tachydysrhythmias?

A)Sympathetic nervous system activation
B)Beta₁-adrenergic receptor activation
C)(+) Dromotropic effect
D)Vagal discharge

Question 44

Which of the following is an example of forward failure?

A)Blood accumulates in the pulmonary capillaries,elevating pressure and causing pulmonary edema.
B)Diminished renal blood flow stimulates the kidney to decrease urinary output and retain Na+ and water.
C)Blood distends the jugular vein.
D)Blood distends the liver,causing hepatomegaly and digestive symptoms.

Question 45

Venodilation

A)increases afterload.
B)decreases preload.
C)increases end-diastolic volume.
D)stretches the ventricular myocardium.

Question 46

A change in preload causes a change in myocardial contractile force.This response is known as (a)

A)(+) inotropic effect.
B)(+) dromotropic effect.
C)Starling's law of the heart.
D)(-) chronotropic effect.

Question 47

Which of the following is least likely to increase cardiac output?

A)Increased heart rate
B)Increased stroke volume
C)Increased venous return
D)Vagal discharge

Question 48

Starling's law of the heart relates force of myocardial contraction with

A)heart rate.
B)preload.
C)end-systolic volume.
D)blood pressure.

Question 49

Digoxin,a drug used in the treatment of heart failure,increases contractile force and is therefore called a

A)diuretic.
B)(+) dromotropic agent.
C)(+) inotropic agent.
D)(+) chronotropic agent.

Question 50

Ventricular systole refers to

A)ventricular depolarization.
B)the opening of the valves of the ventricles.
C)ventricular filling.
D)contraction of the ventricular myocardium.

Question 51

Which of the following statements is correct about cardiac output?

A)Cardiac output is determined by the heart rate and pulse.
B)Stimulation of the sympathetic nerves decreases cardiac output.
C)Vagal discharge increases cardiac output.
D)Cardiac output is determined by heart rate and stroke volume.

Question 52

A patient in heart failure is given a drug that is classified as a beta₁-adrenergic agonist.The drug

A)blocks the Beta₁-adrenergic receptors and causes a (-) chronotropic and (-) inotropic effect.
B)activates the Beta₁-adrenergic receptors and causes bronchoconstriction.
C)activates the Beta₁-adrenergic receptors and causes a (+) inotropic effect.
D)activates the vagus nerve,thereby slowing heart rate and strengthening myocardial contraction.

Question 53

The amount of blood in the ventricle at the end of its resting phase is the

A)end-diastolic volume (EDV).
B)amount of blood in the ventricle at the end of its resting phase.
C)preload.
D)All of the above are true.

Question 54

Furosemide (Lasix),a potent diuretic,is administered in acute ventricular failure to

A)strengthen myocardial contractile force.
B)increase plasma K+ levels.
C)excrete excess water and relieve the edema.
D)relieve pain.

Question 55

Under what condition is end-diastolic volume (EDV) most likely to increase while ejection fraction decreases?

A)Exercise
B)Sympathetic nerve stimulation
C)(+) Inotropic response
D)Heart failure

Question 56

Which of the following is least related to a bradycardia?

A)Greater than 60 beats/min
B)Vagal discharge
C)(-) Chronotropic effect
D)Parasympathetic nerve stimulation of the SA node

Question 57

A drug causes a (+) inotropic effect,a (-) dromotropic effect,and a (-) chronotropic effect.What drug response would you expect to observe?

A)Tachycardia
B)Low blood pressure
C)Ankle edema
D)Slow heart rate

Question 58

Milliliters/beat× beats/min defines

A)stroke volume.
B)ejection fraction.
C)cardiac reserve.
D)cardiac output.

Question 59

Increased return of blood to the heart stretches the heart muscle,thereby

A)stimulating the vagus nerve.
B)increasing stroke volume.
C)closing the atrioventricular valves.
D)increasing coronary blood flow.

Question 60

Milliliters per minute describes

A)stroke volume.
B)heart rate.
C)pulse.
D)cardiac output.

Question 61

Which of the following is not the result of the firing of the sympathetic nerves on the heart?

A)(+) Inotropic effect
B)(+) Chronotropic effect
C)Increased heart rate
D)Vagally induced bradycardia

Question 62

Which of the following does not happen during ventricular diastole?

A)Blood is being pumped into the great vessels.
B)The semilunar valves are closed.
C)Blood is filling the ventricles.
D)Blood is flowing from the atria into the ventricles.

Question 63

Which of the following is the best description of systole and diastole?

A)Atria and ventricles
B)Depolarization and repolarization
C)Contraction and relaxation
D)Heart rate and stroke volume

Question 64

Which of the following elicits the same effect as vagomimetic activity?

A)Beta₁ blockade
B)Activation of the alpha1-adrenergic receptors by ACh
C)Activation of the muscarinic receptors by NE
D)Use of a muscarinic agonist

Question 65

With which of the following is inotropism most associated?

A)Heart rate
B)Force of myocardial contraction
C)Oxygen saturation
D)Systemic vascular resistance

Question 66

Which of the following is happening during atrial systole?

A)The ventricles are relaxed.
B)The AV valves are closed.
C)The atria pump blood into the ventricles.
D)Both A and C are true.

Question 67

Digoxin exerts a (-) chronotropic effect and (+) inotropic effect.Which of the following describes these effects?

A)Slows heart rate and decreases cardiac output
B)Increases heart rate and increases systemic vascular resistance
C)Decreases heart rate and decreases stroke volume
D)Decreases heart rate and strengthens myocardial contraction

Question 68

Atropine is anticholinergic and antimuscarinic and therefore

A)causes a (+) inotropic effect.
B)increases the force of myocardial contraction.
C)decreases heart rate.
D)is used to treat bradydysrhythmias such as heart block and a prolonged P-R interval.

Question 69

With which term is preload synonymous?

A)Cardiac reserve
B)End-diastolic volume
C)Afterload
D)Ejection fraction

Question 70

Cor pulmonale refers to

A)elevation in pulmonary artery pressure and right ventricular hypertrophy.
B)backward failure and pulmonary edema.
C)pulmonary edema.
D)a major cause of left ventricular failure.

Question 71

Which of the following defines cardiac output?

A)Cardiac index× ejection fraction
B)Heart rate× stroke volume
C)Stroke volume× ejection fraction
D)Afterload× heart rate

Question 72

A very anxious person appears in the ER.He has a heart rate of 160 beats/min and indicates that he has a history of panic attacks.He is prescribed an antianxiety agent and a drug to slow his heart rate.Identify the drug (to slow heart rate).

A)Muscarinic antagonist
B)Beta₁-adrenergic blocker
C)Sympathomimetic
D)Vagolytic

Question 73

Which of the following is most apt to cause a (+) inotropic effect?

A)Activation of the alpha1-adrenergic receptors by ACh
B)Activation of the muscarinic receptors by NE
C)Blockade of alpha1-adrenergic receptors
D)Use of a Beta₁-adrenergic agonist

Question 74

Which of the following is least likely to be used in the treatment of left ventricular failure and pulmonary edema?

A)(+) Inotropic agent such as digoxin or dopamine
B)Diuretic such as furosemide (Lasix)
C)Peripheral vasoconstrictor such as norepinephrine (Levophed)
D)Oxygen

Question 75

Which of the following describes Starling's law of the heart?

A)An increase in venous return to the ventricles causes an increase in cardiac output.
B)An increase in preload increases cardiac output.
C)A decrease in preload decreases cardiac output.
D)All of the above are true.

Question 76

An elevation in pulmonary artery pressure is most likely to cause

A)pleural effusion.
B)pulmonary edema.
C)right ventricular hypertrophy.
D)left ventricular failure and pulmonary edema.

Question 77

Which of the following is most apt to induce an autonomically induced bradycardia?

A)Secretion of norepinephrine by the postganglionic adrenergic fibers
B)Activation of the Beta₁-adrenergic receptors
C)Activation of the muscarinic receptors
D)Sympathetic nerve stimulation

Question 78

With which term is afterload most associated?

A)Preload
B)End-diastolic volume
C)Resistance
D)Hypoxemia

Question 79

Jugular vein distention is most associated with

A)right-sided heart failure.
B)aortic valve stenosis.
C)left wall infarct and left ventricular failure.
D)low volume shock right-sided heart failure.