In congestive heart failure, a glycoside that increases the force of myocardial contraction is

The beneficial effects of digitalis in congestive heart failure result in part from the fact that digitalis causes. A decrease in end-diastolic volume
b. A decrease in end-diastolic pressure
c. An increase in stroke volume and cardiac output
d. A decrease in central venous pressure
e. A decrease in rate of the hear where tachycardia exists