A rise in arterial blood pressure stretches the vessel walls which contain baro- receptors. Which of the following responses does this produce? The barorecep- tors send a: A. slower stream of impulses to the vasomotor centre which inhibits it. B. faster stream of impulses to the vasomotor centre which inhibits it. C. slower stream of impulses to the vasomotor centre which stimulates it. D. faster stream of impulses to the vasomotor centre which stimulates it.
Option B. When a blood vessel wall is stretched it stimulates baroreceptors to increase their movement of impulses to the vasomotor centre which inhibits it. This means the smooth muscle in blood vessel walls will loosen up and the vessel diameter will increase and so BP is reduced.
