Negative Feedback Regulation of Blood Pressure

stimulus • Blood pressure determines the flow of blood to and from capillaries. • Low blood pressure results in reduced blood flow. • High blood pressure can cause blood vessels to break. Baroreceptors • The aortic arch carries blood to the body. • The common carotids carry blood to the head. • Baroreceptors measure changes in blood pressure. • High blood pressure stretches artery walls. • Low blood pressure cause less stretch of the walls. Cardiovascular control center • Low blood pressure causes a slower rate of impulses sending information to the cardiovascular center in the brain. • The CV center outputs its own nerve impulses to the heart and blood vessels. Effectors • The heart responds to increased CV center output by beating faster and with greater strength, increasing the flow of blood. • Increased (added) resistance in blood vessels also results from increased nervous stimulation as well as the secretion and action of homones. Return to homeostasis • Baroreceptors detect the return of normal blood pressure. ■ CV center adjusts its output signals to the heart and blood vessels. • Homeostasis is achieved.

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