Question 1

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

Accepted Answer

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

Question 2

Atropine,a muscarinic blocker,

Accepted Answer

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

Question 3

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

Accepted Answer

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. 
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 4

Which of the following statements is correct about cardiac output?

Accepted Answer

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. 
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 5

Venodilation

Accepted Answer

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

Question 6

Vagal stimulation on the heart

Accepted Answer

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. 
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 7

With which term is preload synonymous?

Accepted Answer

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

Question 8

Milliliters per minute describes

Accepted Answer

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

Question 9

Which of the following defines cardiac output?

Accepted Answer

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

Question 10

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

Accepted Answer

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

Question 11

Atropine is a muscarinic antagonist and is therefore used to

Accepted Answer

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

Question 12

Increased afterload (e.g. ,hypertension)

Accepted Answer

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. 
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 13

Vagal stimulation to the heart causes

Accepted Answer

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

Question 14

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

Accepted Answer

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

Question 15

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

Accepted Answer

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

Question 16

An elevation in pulmonary artery pressure is most likely to cause

Accepted Answer

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

Question 17

During atrial systole,the

Accepted Answer

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

Question 18

Cardiac output

Accepted Answer

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. 
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 19

Which of the following refers to a positive inotropic effect?

Accepted Answer

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

Question 20

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

Accepted Answer

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

Exam 17: Function of the Heart

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

Atropine,a muscarinic blocker,

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

Which of the following statements is correct about cardiac output?

Venodilation

Vagal stimulation on the heart

With which term is preload synonymous?

Milliliters per minute describes

Which of the following defines cardiac output?

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

Atropine is a muscarinic antagonist and is therefore used to

Increased afterload (e.g. ,hypertension)

Vagal stimulation to the heart causes

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

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

An elevation in pulmonary artery pressure is most likely to cause

During atrial systole,the

Cardiac output

Which of the following refers to a positive inotropic effect?

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

Introduction to the Human Body

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Integumentary System and Body Temperature

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Anatomy of the Heart

Anatomy of the Blood Vessels and Special Circulations

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