8) The pre-ejection period is increased by negative inotropic agents and conduction disturbances ( T / F ).

9) The isovolumic pressure line is shifted by increasing preload or afterload ( T / F ).

10) Obtaining increased cardiac performance as the result of increased preload indicates contractility has increased ( T / F ).

11) Increased preload increases stroke volume by increasing inotropicity ( T / F ).

12) Ejection fraction is a good index of cardiac performance, and is afterload independent ( T / F ).

13) Drugs that have a positive inotropic effect on the heart decrease the pre-ejection period ( T / F ).

14) Afterload on the left ventricle is decreased when the vascular resistance of the aorta increases ( T / F ).