The elastic recoil of the aorta does all but which of the following?

Nor-epinephrine increases:

In the normal heart at rest, isovolumetric contraction occurs at left ventricular pressures:

In the normal heart, neurons from the Cardiac Acceleration Center stimulate the  cardiac sympathetic nerve which directly stimulates the:

A drug which decreases sodium ion conductance (leakage) in the Sino-atrial node would:

Significantly elevated aortic diastolic pressure would be expected to do which of the following?

Rank in descending order the spontaneous firing frequency of the following  tissues: (fastest to slowest)

Vagal stimulation:

Which of the following directly carries blood away from the left ventricle ?

The bicuspid valve is also known as the: