Identify whether each Item would Increase or decrease stroke volume. Sympathetic stimulation Increasing contractility Stress Dehydration Increasing EDV Increasing afterload Increased heart rate, Acute exercise Decreased venous return. Increasing preload Reset Increase Stroke Volume Increasing EDV Increasing preload Increasing contractility Decreased venous return Stress Acute exercise Decrease Stroke Volume Increasing afterload Increased heart rate Dehydration Sympathetic stimulation