Baroreflex or Vasomotor Pressoreflex
autonomic reflex arc. pressure reflex in muscles.
1. Changes in BP detected by stretch receptors (baroreceptors), in large arteries above heart
a. Aortic sinuses (behind aortic valve cusps)
b. Carotid sinus (base of each internal carotid artery) dilation of _____w/a receptor in it.
2. Vasomotor and cardioinhibitory centers in medulla
3. Inc. BP causes rate of signals to rise, inhibits vasomotor center, decrease sympathetic tone, stimulates cardioinhibitory center, increase parasympathetic output
4. Decr. BP causes rate of signals to drop, excites vasomotor center, incr sympathetic tone, inhibits cardioinhibitory center, decr. parasympathetic output