Question 1

The period of time in which the myocardium is insensitive to further stimulation is called the

Accepted Answer

A)   absolute refractory period.
B)   hyperpolarization period.
C)   AV period.
D)   SA period.
E)   ectopic focus.F) C) and D)
G) A) and D)

Question 2

What abnormal heart rhythm could be caused by an elevated body temperature, excessive sympathetic stimulation, or toxic conditions?

Accepted Answer

A)   bradycardia
B)   atrial fibrillation
C)   second-degree AV node block
D)   tachycardiaE) B) and C)
F) A) and B)

Question 3

Cardiac muscle cells

Accepted Answer

A)   have smooth ER but no T tubules.
B)   form the heart valves.
C)   are maintained by an extensive capillary network.
D)   develop a significant oxygen debt during systole.
E)   do not contain actin and myosin like skeletal muscle cells.F) B) and D)
G) C) and D)

Question 4

The epicardium

Accepted Answer

A)   covers the surface of the heart.
B)   lines the walls of the ventricles.
C)   is known as the fibrous pericardium.
D)   attaches inferiorly to the diaphragm.
E)   is also called endocardium.F) B) and E)
G) B) and D)

Question 5

Ventricular contraction begins at the

Accepted Answer

A)   AV bundle.
B)   apex of the heart.
C)   base of the heart.
D)   superior portion of the interventricular septum.
E)   top of the ventricles.F) A) and E)
G) D) and E)

Question 6

Which of the following is true?

Accepted Answer

A)   Blood enters the right and left atria only during diastole.
B)   Most ventricular filling occurs before the atria contract.
C)   During ventricular systole, the AV valves open.
D)   The semilunar valves remain closed throughout ventricular systole.
E)   Most of end-diastolic volume comes from active filling.F) D) and E)
G) None of the above

Question 7

Use the following two choices:
-sympathetic stimulation of the heart

Accepted Answer

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

Question 8

The volume of blood pumped during each cardiac cycle is the

Accepted Answer

A)   stroke volume.
B)   cardiac output.
C)   cardiac reserve.
D)   end-systolic volume.
E)   end-diastolic volume.F) B) and E)
G) D) and E)

Question 9

-Blood from the pulmonary veins is entering this chamber of the heart.

Accepted Answer

The answer of 
-Blood from the pulmonary veins is entering...

Question 10

If the SA node is nonfunctional, which of the following is most likely to occur?

Accepted Answer

A)   The heart will go into asystole (stop) .
B)   Tachycardia will develop.
C)   Another portion of the heart will become the pacemaker.
D)   The heart will go into defibrillation.
E)   The heart will be desensitized.F) A) and E)
G) B) and E)

Question 11

Pressure in the right ventricle must exceed pressure in the ____ before the right ventricle can eject blood.

Accepted Answer

A)   superior vena cava
B)   coronary sinus
C)   pulmonary trunk
D)   aorta
E)   pulmonary veins.F) A) and B)
G) A) and C)

Question 12

Increased vagal stimulation would cause

Accepted Answer

A)   the heart rate to decrease.
B)   the heart rate to increase.
C)   force of contraction to increase.
D)   stroke volume to increase.
E)   no change in heart rate, stroke volume, or force of contraction.F) A) and E)
G) A) and C)

Question 13

Which of the following will depolarize immediately after the AV node depolarizes?

Accepted Answer

A)   the AV bundle
B)   Purkinje fibers
C)   atrial myocardium
D)   bundle branches in the ventricular septum
E)   the SA nodeF) D) and E)
G) None of the above

Question 14

The tricuspid valve is closed

Accepted Answer

A)   during active filling of the ventricles.
B)   when the mitral valve is open.
C)   while the atria are contracting.
D)   during ejection.
E)   during passive filling of the ventricles.F) A) and D)
G) A) and E)

Question 15

Match the blood vessel with the appropriate description.
-superior vena cava

Accepted Answer

A)  returns blood to the heart from the lower extremities
B)  returns blood to the heart from the lungs
C)  carries blood from the left ventricle into systemic circulation
D)  returns blood to the heart from the head and neck
E)  carries blood from the right ventricle to the lungsF) None of the above
G) All of the above

Question 16

Which of the following statements regarding intrinsic regulation of the heart is true?

Accepted Answer

A)   Stretching the SA node will decrease generation of action potentials in the node.
B)   Decreased venous return increases cardiac output.
C)   The heart's pumping effectiveness is greatly influenced by small changes in afterload.
D)   If cardiac muscle fibers are slightly stretched, they have a stronger contraction force.
E)   If cardiac muscle fibers are slightly stretched, they have a weaker contraction force.F) A) and E)
G) All of the above

Question 17

-Blood exiting the aortic semilunar valve is leaving this chamber of the heart.

Accepted Answer

The answer of 
-Blood exiting the aortic semilunar valve is...

Question 18

Use the following two choices:
- ↑\uparrow↑  or  ↓\downarrow↓  in ECF K+ levels

Accepted Answer

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

Question 19

The pericardial sac is lined with

Accepted Answer

A)   fibrous pericardium.
B)   parietal pericardium.
C)   visceral pericardium.
D)   myocardium.
E)   epicardium.F) A) and B)
G) A) and C)

Question 20

In a physiology lab, the students designed an experiment to illustrate how the heart responds to changes in blood pressure. Everyone relaxed and then did a headstand. Which of the following observations are consistent with the change in the function of their hearts?

Accepted Answer

A)   increased heart rate
B)   decreased heart rate
C)   increased stroke volume
D)   decreased stroke volume
E)   both decreased heart rate and increased stroke volumeF) None of the above
G) All of the above

Exam 20: Cardiovascular System: the Heart

Cardiac muscle cells

Correct AnswerverifiedShow Answer

The volume of blood pumped during each cardiac cycle is the

Correct AnswerverifiedShow Answer

Use the following two choices: - ↑\uparrow↑ or ↓\downarrow↓ in ECF K+ levels

Correct AnswerverifiedShow Answer

Which of the following statements regarding intrinsic regulation of the heart is true?

Correct AnswerverifiedShow Answer

Which of the following will depolarize immediately after the AV node depolarizes?

Correct AnswerverifiedShow Answer

The pericardial sac is lined with

Correct AnswerverifiedShow Answer

Match the blood vessel with the appropriate description. -superior vena cava

Correct AnswerverifiedShow Answer

In a physiology lab, the students designed an experiment to illustrate how the heart responds to changes in blood pressure. Everyone relaxed and then did a headstand. Which of the following observations are consistent with the change in the function of their hearts?

Correct AnswerverifiedShow Answer

Which of the following is true?

Correct AnswerverifiedShow Answer

-Blood exiting the aortic semilunar valve is leaving this chamber of the heart.

Correct AnswerverifiedShow Answer

Pressure in the right ventricle must exceed pressure in the ____ before the right ventricle can eject blood.

Correct AnswerverifiedShow Answer

The period of time in which the myocardium is insensitive to further stimulation is called the

Correct AnswerverifiedShow Answer

Increased vagal stimulation would cause

Correct AnswerverifiedShow Answer

The tricuspid valve is closed

Correct AnswerverifiedShow Answer

Ventricular contraction begins at the

Correct AnswerverifiedShow Answer

The epicardium

Correct AnswerverifiedShow Answer

Use the following two choices: -sympathetic stimulation of the heart

Correct AnswerverifiedShow Answer

If the SA node is nonfunctional, which of the following is most likely to occur?

Correct AnswerverifiedShow Answer

What abnormal heart rhythm could be caused by an elevated body temperature, excessive sympathetic stimulation, or toxic conditions?

Correct AnswerverifiedShow Answer

-Blood from the pulmonary veins is entering this chamber of the heart.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Use the following two choices: - $\uparrow$ or $\downarrow$ in ECF K⁺ levels

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