<prompt> All are effects of sympathetic stimulation, EXCEPT:Increased conduction velocityIncreased hea rateIncreased refractory periodIncreased contractility of hea  <response>: C i.e. Increased refractory periodEffect of sympathetic system on hea mediated by Pi and ix receptorsSA nodeIncrease in hea rateA.V. nodeIncrease in conduction velocityHis- Purkinje systemIncrease in conduction velocityAtriaIncrease in contractility conduction velocityVentriclesIncrease in contractility 