Question 1

The long refractory period of cardiac muscle prevents tetanic contractions of the heart.

Accepted Answer

A) True 
 B)False

Question 2

Compared to cardiac muscle tissue,skeletal muscle tissue has a(n)____________________ duration for its refractory period.

Accepted Answer

The answer of Compared to cardiac muscle tissue,skeletal muscle tissue...

Question 3

According to the Frank-Starling law of the heart,the greater the stroke volume,the smaller the subsequent end-diastolic volume will be,because as more blood is squeezed out,the heart cannot fill as completely during the next diastole.

Accepted Answer

A) True 
 B)False

Question 4

A swishy murmur heard between the second and first heart sounds is indicative of a(n)____________________ (stenotic or insufficient)____________________ (AV or semilunar)valve.

Accepted Answer

insufficie...

Question 5

What does the Frank-Starling law of the heart state?

Accepted Answer

A)   The shorter the initial length of the cardiac muscle fibres prior to contraction, the more forceful will be the subsequent contraction because the fibres are already partially contracted.
B)   Increasing the venous return increases the end-diastolic volume, which leads to an increased stroke volume, so the heart normally pumps out all of the blood returned to it.
C)   As cardiac output is reduced, blood pools in the vasculature so that arterial blood pressure increases.
D)   The output of the left side of the heart must always exceed that of the right side of the heart because the right side pumps blood only to the lungs, whereas the left side must pump blood to the rest of the body.E) A) and B)
F) A) and C)

Question 6

Match the EKG feature with the correct characteristic by using the answer code:
-atrial depolarization

Accepted Answer

A)  P wave
B)  QRS complex
C)  T wave
D)  PR interval
E)  TP intervalF) ST segmentG) A) and E)
H) None of the above

Question 7

Which statement is correct for the cardiac muscle?

Accepted Answer

A)   It extracts oxygen and nutrients from the blood within its chambers.
B)   It receives its blood supply primarily during ventricular systole when blood is forced into the vessels supplying the heart.
C)   It receives its blood supply as the blood returning to the heart from the lung passes through the cardiac circulation before being pumped to the systemic circulation.
D)   It receives most of its blood supply during ventricular diastole by means of the coronary circulation.E) A) and C)
F) C) and D)

Question 8

A cardiac muscle cell contraction averages about how many msec in duration?

Accepted Answer

A)   50
B)   100
C)   150
D)   300E) All of the above
F) A) and D)

Question 9

Which of the following occurs when an individual is sympathetically stimulated?

Accepted Answer

A)   The SA node depolarizes more rapidly.
B)   More ATP results in more sarcomere cross-bridge attachments.
C)   Ventricles contract harder than atria.
D)   The SA node repolarizes more slowly.E) A) and B)
F) None of the above

Question 10

What is the primary function of the pericardial sac?

Accepted Answer

A)   to prevent excessive expansion of the heart as it fills with blood
B)   to secrete a fluid that reduces friction as the heart beats
C)   to serve as a reservoir for blood to be used during strenuous exercise
D)   to provide oxygen and nutrients to the heart muscleE) A) and D)
F) C) and D)

Question 11

Patients with diastolic heart failure would present with ____________________

Accepted Answer

A)   failure of the ventricles to fill normally.
B)   decrease in cardiac contractility.
C)   heart pumping out more blood than it should with each contraction.
D)   heart muscle relaxing longer than it should with each contraction.E) A) and B)
F) B) and C)

Question 12

Cardiac tamponade refers to failure of the AV node to transmit the action potential from the atria to the ventricles.

Accepted Answer

A) True 
 B)False

Question 13

What is the function of the atrioventricular node?

Accepted Answer

A)   to excite the left and right atrium
B)   to control the heart rate
C)   to prevent the atria and ventricles from contracting simultaneously
D)   to repolarize the heart after systoleE) B) and D)
F) C) and D)

Question 14

Contraction of the spirally arranged cardiac muscle fibres produces a wringing effect for efficient pumping.

Accepted Answer

A) True 
 B)False

Question 15

The ____________________ ensures that atrial excitation and contraction are complete before ventricular excitation and contraction commence.

Accepted Answer

The answer of The ____________________ ensures that atrial excitation and...

Question 16

Indicate which valve abnormality is being described by using the answer code (options may be used more than once or not at all) :
-valve does not close completely

Accepted Answer

A)  valvular stenosis
B)  valvular insufficiencyC) A) and B)
D) undefined

Question 17

The function of the chordae tendineae and papillary muscles is to hold the AV valves wide open during diastole to ensure complete ventricular filling.

Accepted Answer

A) True 
 B)False

Question 18

The ____________________ extracts cholesterol from the blood and converts it into ____________________,which are secreted into the bile.

Accepted Answer

The answer of The ____________________ extracts cholesterol from the blood...

Question 19

The ventricles always depolarize at the same rate as the SA node depolarizes.

Accepted Answer

A) True 
 B)False

Question 20

Twelve complete ECG patterns are recorded from a subject over 10 seconds.If this pattern continues,what is the rate of the heartbeat in the subject?

Accepted Answer

A)   60 beats per minute
B)   72 beats per minute
C)   90 beats per minute
D)   108 beats per minuteE) All of the above
F) C) and D)

Exam 7: Cardiac Physiology

The ____________________ ensures that atrial excitation and contraction are complete before ventricular excitation and contraction commence.

Correct AnswerverifiedShow Answer

Contraction of the spirally arranged cardiac muscle fibres produces a wringing effect for efficient pumping.

Correct AnswerverifiedShow Answer

Compared to cardiac muscle tissue,skeletal muscle tissue has a(n)____________________ duration for its refractory period.

Correct AnswerverifiedShow Answer

What is the function of the atrioventricular node?

Correct AnswerverifiedShow Answer

A cardiac muscle cell contraction averages about how many msec in duration?

Correct AnswerverifiedShow Answer

Twelve complete ECG patterns are recorded from a subject over 10 seconds.If this pattern continues,what is the rate of the heartbeat in the subject?

Correct AnswerverifiedShow Answer

The long refractory period of cardiac muscle prevents tetanic contractions of the heart.

Correct AnswerverifiedShow Answer

What does the Frank-Starling law of the heart state?

Correct AnswerverifiedShow Answer

What is the primary function of the pericardial sac?

Correct AnswerverifiedShow Answer

The ____________________ extracts cholesterol from the blood and converts it into ____________________,which are secreted into the bile.

Correct AnswerverifiedShow Answer

Cardiac tamponade refers to failure of the AV node to transmit the action potential from the atria to the ventricles.

Correct AnswerverifiedShow Answer

Match the EKG feature with the correct characteristic by using the answer code: -atrial depolarization

Correct AnswerverifiedShow Answer

The ventricles always depolarize at the same rate as the SA node depolarizes.

Correct AnswerverifiedShow Answer

Indicate which valve abnormality is being described by using the answer code (options may be used more than once or not at all) : -valve does not close completely

Correct AnswerverifiedShow Answer

Patients with diastolic heart failure would present with ____________________

Correct AnswerverifiedShow Answer

According to the Frank-Starling law of the heart,the greater the stroke volume,the smaller the subsequent end-diastolic volume will be,because as more blood is squeezed out,the heart cannot fill as completely during the next diastole.

Correct AnswerverifiedShow Answer

Which of the following occurs when an individual is sympathetically stimulated?

Correct AnswerverifiedShow Answer

Which statement is correct for the cardiac muscle?

Correct AnswerverifiedShow Answer

The function of the chordae tendineae and papillary muscles is to hold the AV valves wide open during diastole to ensure complete ventricular filling.

Correct AnswerverifiedShow Answer

A swishy murmur heard between the second and first heart sounds is indicative of a(n)____________________ (stenotic or insufficient)____________________ (AV or semilunar)valve.

Correct Answerverifiedinsufficie...View AnswerShow 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

The extracts cholesterol from the blood and converts it into ,which are secreted into the bile.

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

A swishy murmur heard between the second and first heart sounds is indicative of a(n) (stenotic or insufficient) (AV or semilunar)valve.

Correct Answer
verified
insufficie...
View Answer