Which of the following would NOT result from an increase in ventricular contractility?
A) increased ejection fraction
B) increased stroke volume
C) decreased end-diastolic volume
D) decreased end-systolic volume
E) increased proportion of end-diastolic volume that is ejected - Answer C
Which of the following would NOT result from an increase in ventricular contractility?
A) increased ejection fraction
B) increased stroke volume
C) decreased end-diastolic volume
D) decreased end-systolic volume
E) increased proportion of end-diastolic volume that is ejected - Answer C
Which of the following best describes the effect of sympathetic activity on
ventricular contractile cells?
A) The rates of contraction and relaxation both decrease, whereas the force
of contraction increases.
B) The rates of contraction and relaxation both increase, whereas the force
of contraction decreases.
C) The rate of contraction and the force of contraction both increase, whereas the rate of
relaxation decreases.
D) The rates of contraction and relaxation and the force of contraction all increase.
,E) The force of contraction increases, whereas the rates of contraction and relaxation are not
affected. - Answer D
Which of the following describes the effect of end- diastolic volume on stroke volume?
, A) An increase in end-diastolic volume stretches ventricular muscle cells to lengths greater
than optimum, decreasing the strength of contraction and thereby decreasing stroke volume.
B) An increase in end-diastolic volume stretches ventricular muscle cells to lengths closer
to optimum, increasing the strength of contraction and thereby increasing stroke volume.
C) A decrease in end- diastolic volume creates a vacuum drawing more blood into the
ventricle increasing stroke volume.
D) A decrease in end- diastolic volume allows ventricular muscle cells to relax more during
diastole, allowing more blood to return to the heart increasing stroke volume.
E) A decrease in end- diastolic volume allows cardiac muscle to relax, conserving
energy for the next contraction, thereby increasing stroke volume of that next
contraction. - Answer B
Which of the following variables is N OT an intrinsic factor that alters cardiac function?
A) end-systolic volume
B) hormonal stimulation
C) atrial pressure
D) Starling's law
E) preload - Answer B
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