Control of Blood Pressure

Control of Blood Pressure - Control of Blood Pressure

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Control of Blood Pressure Changes in blood pressure are  routinely made in order to direct  appropriate amounts of oxygen and  nutrients to specific parts of the body.  For example, when exercise demands  additional supplies of oxygen to skeletal  muscles, blood delivery to these  muscles increases, while blood delivery  to the digestive organs decreases.  Adjustments in blood pressure are also  required when forces are applied to  your body, such as when starting or  stopping in an elevator.
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Blood pressure can be adjusted by  producing changes in the following  variables: Cardiac output can be altered  by changing stroke volume or  heart rate. Resistance to blood flow in the  blood vessels is most often  altered by changing the diameter  of the vessels (vasodilation or  vasoconstriction). Changes in  blood viscosity (its ability to flow)  or in the length of the blood  vessels (which increases with 
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weight gain) can also alter  resistance to blood flow. The following mechanisms help  regulate blood pressure: The cardiovascular center  provides a rapid, neural  mechanism for the regulation of  blood pressure by managing  cardiac output or by adjusting  blood vessel diameter. Located in  the medulla oblongata of the  brain stem, it consists of three  distinct regions: The cardiac center  stimulates cardiac output 
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Control of Blood Pressure - Control of Blood Pressure

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