Deck 39: the Cardiac Function Curve

Question 1

Increasing preload by itself does all of the following EXCEPT

A) Increases stroke volume
B) Increases strength of contraction
C) Stretches the hea rt
D) Increases cardiac work
E) Decrea ses he art rate

Answer 1

E

Question 2

The ejection fraction of the heart can be calculated as

A) ESV - EDV
B) EDV - ESV
C) 1 - ESV / EDV
D) SV / ESV
E) SV x HR

Answer 2

C

Question 3

The afterload of the heart is the

A) End systolic volume
B) End diastolic volume
C) Central venous pressure
D) Aortic pre ssu re
E) Pulm onary venous p ressure

Answer 3

D

Question 4

The str en gth of t he he ar t's c on tra ctio n is Increased by

A) Stretch
B) Afterload
C) Sympathetic stimulation
D) Parasympathetic stimulation
E) Both A and C are correct

Question 5

The preload of the heart is the

A) End systolic volume
B) End diastolic volume
C) Cen tral ven ou s pre ssu re
D) Aortic pressure
E) Pulm onary arterial pressure

Question 6

The gre ates t con tribution to the to tal ene rgy of flo wing blood is its

A) Gravitational potential energy
B) Kinetic energy
C) PV energy
D) Mom entum
E) Equivalent pressure

Question 7

Which line segment in the PV loop in Fig. 1 represents isovolumetric relaxation?

A) AB
B) BC
C) CD
D) DE
E) EA

Question 8

W hen an artery is severed by a cut to skin and blood spurts upward, there is a conversion of

A) Gravitational potential energy to kinetic energy
B) PV energy to gravitational potential energy
C) Equivalent pressure to hydraulic pressure
D) Mom entum to gravitational energy
E) Inertial force to gravitational force

Question 9

Which point on the PV loop in Fig. 1 corresponds to the closing of the aortic valve?

A) A
B) B
C) C
D) D
E) E

Question 10

Which point on the PV loop in Fig. 1. corresponds to the opening of the aortic valve?

A) A
B) B
C) C
D) D
E) E

Question 11

Which of the following is NOT an effect of hypertension ?

A) Delayed open ing of the aortic valve
B) Increased work of the he art
C) Increased stroke volume for a given preload
D) Given a stroke volume, an Increase in the preload
E) Given a cardiac output, an Increase in the preload

Question 12

Which line segment in the PV diagram in Fig. 1 corresponds to ejection of blood?

A) AB
B) BC
C) CD
D) CE
E) EA
1

Question 13

The va ria ble tha t m os t gr ea tly af fe cts ca rd iac co ntr ac tility is

A) The preload
B) The afterload
C) Cardiac stretch
D) Sympathetic tone
E) Both A and C

Question 14

The stoke volume for the heart whose PV diagram is shown in Fig. 1 is the volume difference between

A) D and E
B) E and A
C) B and A
D) C and D
E) B and C

Question 15

The Frank-Starling Law of the Heart states that

A) Increasing afterload Increases the strength of contraction
B) The heart operates on the ascend ing lim b of the length-tension curve
C) Increasing preload Increases end systolic volume
D) Increasing preload Increases the stroke volume of both ventricles
E) Increasing preload Increases end diastolic volume

Question 16

Which line segment in the PV loop (Fig. 1) corresponds to isovolumetric contraction?

A) AB
B) BC
C) CD
D) DE
E) EA