<prompt> Decrease in BP causes:Inhibition of vasoconstrictor centerDis-inhibition of vasoconstrictor centerIncreased stimulation of cardiac inhibitory centerIncreased vagal stimulation  <response>: Ans: B Dis-inhibition of vasoconstrictor center Ref: Pal GK. Blood pressure and its regulation. In: Textbook of Medical Physiology. Ahuja Publishing House. 2011: 42: 324.Explanation:Reduction in BP is perceived by baroreceptors and less nerve traffic signals is sent to cardiac inhibitory center CIc Less stimulation to CIcThere will be dis-inhibition of vasoconstrictor center Vasomotor center by GICIncreased VMC activity stimulates sympathetic activityBaroreceptor BP -stimulation stretch of baroreceptors carotid sinus aortic arch - through IX X cranial nerve - stimulation of NTS - inhibition of VMC- sympathetic discharges - BP SBP by CO and DBP by vasoconstriction and also HR BP- lessno stimulation stretch of baroreceptors carotid sinus aortic arch - through IX X cranial nerve - lessno stimulation of NTS - dis-inhibition of VMC - sympathetic discharges -BP SBP by CO and DBP by vasoconstriction and also HR.Also, Refer Baroreceptor mechanism figure in the previous questions explanation. 