First response to decreased blood volume: (A) Increased hea rate, (B) Tachypnea, (C) Hypotension, (D) Disorientation
Answer is A. Baroreceptor reflex is an immediate compensatory mechanism in shock. There is stimulation of aerial baroreceptors and so sympathetic output is increased leading to vasoconstriction and reflex tachycardia. Ref: Textbook of medical physiology by N Geetha, 2nd edition, page no. 184