Chemoreceptors operate between pressure range of:: (A) Below 90 mm HG, (B) 40-100 mm Hg, (C) 70-150 mm Hg, (D) 70-220 mm Hg
Answer is B. In nervous circulatory mechanism of aerial BP the chemoreceptor reflex operates between 40-100 mm Hg . Fallen the aerial BP less than 80 mmhg decreases blood flow to the tissues this decreases pO2 2 carotid and aoic bodies and causes stimulation of VMC and CVC and respiratory centre.