When ventricular pressure exceeds atrial pressure, the:
A. AV valves close.
B. atria pump blood into the ventricles.
C. ventricle is in diastole.
D.
... [Show More] blood is pumped into the atrium.
Afterload is:
A. the name given to an increase in end-diastolic volume.
B. the arterial pressure that the ventricles must overcome to eject blood.
C. the amount cardiac output must increase during exercise.
D. another name for venous return.
Stimulation of the heart via the sympathetic nerves would:
A. slow heart rate.
B. decrease stroke volume.
C. increase the force of ventricular contraction.
D. increase end-diastolic volume.
Within normal limits, an increase in preload leads to:
A. an increase in cardiac output and force of left ventricular contraction.
B. a decrease in cardiac output and force of left ventricular contraction.
C. an increase in cardiac output and a decrease in force of left ventricular contraction.
D. a decrease in cardiac output and an increase in force of left ventricular contraction.
A+
End-diastolic volume minus end-systolic volume is equal to:
A. cardiac output
B. cardiac reserve
C. pulse volume
D. stroke volume
The product of stroke volume and heart rate is known as:
A. end-diastolic volume.
B. end-systolic volume.
C. cardiac output.
D. ejection fraction.
Increased vagal stimulation would cause:
A. the heart rate to decrease.
B. the heart rate to increase.
C. no change in heart rate.
An increase in extracellular calcium generally increases:
A. the heart rate
B. the force of contraction
C. autonomic stimulation of the heart
D. sodium channel opening
Lowered extracellular potassium levels will lower heart rate because:
A. the resting membrane potential is hyperpolarized.
A+
B. ectopic action potentials occur.
C. action potential amplitude declines.
D. more sodium channels open.
Increased afterload will:
A. increase stroke volume.
B. decrease end-systolic volume.
C. increase the duration of ventricular ejection.
D. increase isovolumetric contraction.
Which of the following will increase end-diastolic volume?
A. vasodilation
B. contracting the muscles in t [Show Less]