Question 1

Use the following two choices:
-stimulation from vagus nerve

Accepted Answer

A) ↑ heart rate 
B) ↓ heart rate 
A) ↑ heart rate 
B) ↓ heart rate

Question 2

-When blood passes through the bicuspid valve, it enters this chamber of the heart.

Accepted Answer

The answer of  
-When blood passes through the bicuspid...

Question 3

-Blood from the body returns directly to this chamber of the heart.

Accepted Answer

The answer of  
-Blood from the body returns directly...

Question 4

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

Question 5

The action potentials are slowed at the AV node to allow the

Accepted Answer

A)  ventricles to repolarize. 
B)  ventricles to completely empty of blood. 
C)  pacemaker to reset for the next beat. 
D)  atria to complete their contraction. 
E)  atria to begin their contraction. 
A)  ventricles to repolarize. 
B)  ventricles to completely empty of blood. 
C)  pacemaker to reset for the next beat. 
D)  atria to complete their contraction. 
E)  atria to begin their contraction.

Question 6

The period of isovolumetric contraction is immediately followed by

Accepted Answer

A)  the period of ejection. 
B)  AV node depolarization. 
C)  passive ventricular filling. 
D)  atrial contraction. 
E)  isovolumetric relaxation. 
A)  the period of ejection. 
B)  AV node depolarization. 
C)  passive ventricular filling. 
D)  atrial contraction. 
E)  isovolumetric relaxation.

Question 7

The P wave of an ECG indicates

Accepted Answer

A)  atrial depolarization. 
B)  atrial repolarization. 
C)  ventricular depolarization. 
D)  ventricular repolarization. 
E)  threshold. 
A)  atrial depolarization. 
B)  atrial repolarization. 
C)  ventricular depolarization. 
D)  ventricular repolarization. 
E)  threshold.

Question 8

The plateau phase seen during the action potential of a cardiac muscle cell is due to the

Accepted Answer

A)  sodium-potassium pump. 
B)  opening of sodium channels. 
C)  continuing to have open calcium channels. 
D)  closure of chloride channels. 
E)  closing of calcium channels. 
A)  sodium-potassium pump. 
B)  opening of sodium channels. 
C)  continuing to have open calcium channels. 
D)  closure of chloride channels. 
E)  closing of calcium channels.

Question 9

Calcium channel blockers are frequently used to

Accepted Answer

A)  increase the heart rate. 
B)  treat tachycardia or other arrhythmias. 
C)  speed up conduction of impulses through the AV node. 
D)  slow the closing of potassium ion channels. 
E)  treat bradycardia and low blood pressure. 
A)  increase the heart rate. 
B)  treat tachycardia or other arrhythmias. 
C)  speed up conduction of impulses through the AV node. 
D)  slow the closing of potassium ion channels. 
E)  treat bradycardia and low blood pressure.

Question 10

-The figure illustrates the cardiac action potential. What does "D" represent?

Accepted Answer

A)  early repolarization phase 
B)  plateau phase 
C)  final repolarization phase 
D)  depolarization phase 
A)  early repolarization phase 
B)  plateau phase 
C)  final repolarization phase 
D)  depolarization phase

Question 11

Which of the following is NOT an enzyme given to someone experiencing a myocardial infarction to break up blood clots?

Accepted Answer

A)  streptokinase 
B)  tissue plasminogen activator (t-Pa) 
C)  nitroglycerin 
D)  urokinase 
A)  streptokinase 
B)  tissue plasminogen activator (t-Pa) 
C)  nitroglycerin 
D)  urokinase

Question 12

The cardioregulatory center of the brain is located in the

Accepted Answer

A)  hypothalamus. 
B)  medulla oblongata. 
C)  cerebellum. 
D)  cerebrum. 
E)  diencephalons. 
A)  hypothalamus. 
B)  medulla oblongata. 
C)  cerebellum. 
D)  cerebrum. 
E)  diencephalons.

Question 13

What is the importance of the delay in the action potential in the AV node?

Accepted Answer

A)  It allows the action potential to reach both ventricles at the same time. 
B)  It allows an action potential to reach the left atrium so both atria contract together. 
C)  It slows the rate of contraction of the ventricles. 
D)  It allows time for the atria to be filled with blood. 
A)  It allows the action potential to reach both ventricles at the same time. 
B)  It allows an action potential to reach the left atrium so both atria contract together. 
C)  It slows the rate of contraction of the ventricles. 
D)  It allows time for the atria to be filled with blood.

Question 14

-Identify structure "C" on the heart diagram.

Accepted Answer

A)  left atrium 
B)  aortic semilunar valve 
C)  bicuspid (mitral) valve 
D)  right atrium 
E)  pulmonary semilunar valve 
A)  left atrium 
B)  aortic semilunar valve 
C)  bicuspid (mitral) valve 
D)  right atrium 
E)  pulmonary semilunar valve

Question 15

Depolarization of a cardiac muscle cell occurs as the result of

Accepted Answer

A)  a decrease in the permeability of the cell membrane to sodium. 
B)  the opening of voltage-gated sodium channels and voltage-gated calcium channels. 
C)  the closure of voltage-gated calcium channels. 
D)  the opening of voltage-gated potassium channels. 
E)  the closure of the voltage-gated sodium channels. 
A)  a decrease in the permeability of the cell membrane to sodium. 
B)  the opening of voltage-gated sodium channels and voltage-gated calcium channels. 
C)  the closure of voltage-gated calcium channels. 
D)  the opening of voltage-gated potassium channels. 
E)  the closure of the voltage-gated sodium channels.

Question 16

Use the following key to mark the most correct answer.
-(1) normal heart rate;
(2) heart rate during hypothermia
A

Accepted Answer

A) Choose A if the first item is greater than the second item. 
B) Choose B if the first item is less than the second item. 
C) Choose C if the first item is equal or nearly equal to the second item. 
A) Choose A if the first item is greater than the second item. 
B) Choose B if the first item is less than the second item. 
C) Choose C if the first item is equal or nearly equal to the second item.

Question 17

In the cardiac cycle,

Accepted Answer

A)  the right atrium and the right ventricle contract simultaneously. 
B)  the two atria relax while the two ventricles contract. 
C)  the left atrium contracts before the right atrium. 
D)  all four chambers of the heart contract at the same time. 
E)  all four chambers of the heart are in systole at the same time. 
A)  the right atrium and the right ventricle contract simultaneously. 
B)  the two atria relax while the two ventricles contract. 
C)  the left atrium contracts before the right atrium. 
D)  all four chambers of the heart contract at the same time. 
E)  all four chambers of the heart are in systole at the same time.

Question 18

Aortic stenosis results from

Accepted Answer

A)  a hole in the interatrial septum. 
B)  a weakening of heart muscle. 
C)  a narrowed opening through the aortic valve. 
D)  low oxygen levels. 
E)  leakage from the AV valves. 
A)  a hole in the interatrial septum. 
B)  a weakening of heart muscle. 
C)  a narrowed opening through the aortic valve. 
D)  low oxygen levels. 
E)  leakage from the AV valves.

Question 19

Blood does not enter or leave the ventricles during the period called

Accepted Answer

A)  ejection. 
B)  rapid filling. 
C)  atrial systole. 
D)  isovolumetric contraction. 
E)  active and passive filling. 
A)  ejection. 
B)  rapid filling. 
C)  atrial systole. 
D)  isovolumetric contraction. 
E)  active and passive filling.

Question 20

Which of the following might increase the risk for cardiovascular disease?

Accepted Answer

A)  stopping smoking 
B)  exercise 
C)  maintaining normal cholesterol levels 
D)  chronic stress 
E)  lots of fiber in the diet 
A)  stopping smoking 
B)  exercise 
C)  maintaining normal cholesterol levels 
D)  chronic stress 
E)  lots of fiber in the diet

Exam 20: Cardiovascular System: the Heart

Use the following two choices: -stimulation from vagus nerve

-When blood passes through the bicuspid valve, it enters this chamber of the heart.

-Blood from the body returns directly to this chamber of the heart.

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

The action potentials are slowed at the AV node to allow the

The period of isovolumetric contraction is immediately followed by

The P wave of an ECG indicates

The plateau phase seen during the action potential of a cardiac muscle cell is due to the

Calcium channel blockers are frequently used to

-The figure illustrates the cardiac action potential. What does "D" represent?

Which of the following is NOT an enzyme given to someone experiencing a myocardial infarction to break up blood clots?

The cardioregulatory center of the brain is located in the

What is the importance of the delay in the action potential in the AV node?

-Identify structure "C" on the heart diagram.

Depolarization of a cardiac muscle cell occurs as the result of

Use the following key to mark the most correct answer. -(1) normal heart rate; (2) heart rate during hypothermia A

In the cardiac cycle,

Aortic stenosis results from

Blood does not enter or leave the ventricles during the period called

Which of the following might increase the risk for cardiovascular disease?

The Human Organism

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Integration of Nervous System Functions

The Special Senses

Autonomic Nervous System

Functional Organization of the Endocrine System

Endocrine Glands

Cardiovascular System: Blood

Cardiovascular System: Blood Vessels and Circulation

Lymphatic System and Immunity

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