Question 1

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

Question 2

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.F) C) and D)
G) All of the above

Question 3

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) A) and B)

Question 4

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.F) B) and D)
G) D) and E)

Question 5

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.F) A) and B)
G) B) and D)

Question 6

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.F) B) and D)
G) C) and D)

Question 7

-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 phaseE) All of the above
F) C) and D)

Question 8

The cardioregulatory center of the brain is located in the

Accepted Answer

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

Question 9

The P wave of an ECG indicates

Accepted Answer

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

Question 10

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.F) A) and D)
G) A) and C)

Question 11

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.F) A) and B)
G) B) and C)

Question 12

Use the following two choices:
-stimulation from vagus nerve

Accepted Answer

A)  ↑ heart rate
B)  ↓ heart rateC) A) and B)
D) undefined

Question 13

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.F) D) and E)
G) A) and B)

Question 14

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.D) All of the above
E) A) and C)

Question 15

-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 valve,...

Question 16

-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 valveF) A) and B)
G) A) and C)

Question 17

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

Accepted Answer

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

Question 18

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)   urokinaseE) A) and D)
F) All of the above

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.F) A) and B)
G) A) and C)

Question 20

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.E) None of the above
F) A) and B)

Exam 20: Cardiovascular System: the Heart

The cardioregulatory center of the brain is located in the

Correct AnswerverifiedShow Answer

Aortic stenosis results from

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Calcium channel blockers are frequently used to

Correct AnswerverifiedShow Answer

The P wave of an ECG indicates

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

-Identify structure "C" on the heart diagram.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The period of isovolumetric contraction is immediately followed by

Correct AnswerverifiedShow Answer

In the cardiac cycle,

Correct AnswerverifiedShow Answer

Depolarization of a cardiac muscle cell occurs as the result of

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Use the following two choices: -stimulation from vagus nerve

Correct AnswerverifiedShow Answer

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

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

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

Correct Answer
verified