<prompt> Vagal stimulation of the hea causes all, EXCEPT:Decreased Hea RateDecreased force of Hea contractionDecreased Cardiac Output.Decreased R-R interval in ECG  <response>: Parasympathetic supply to the hea by vagus nerve causes decreased hea rate, decreased force of contraction, decreased cardiac output. R-R interval is the time interval between consecutive hea beats in the ECG. So a decrease in hea rate increases the R-R interval. 