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BLOOD PRESSURE LAB Blood pressure (BP)  Blood pressure is the force that blood exerts against blood vessel walls  BP = CO x TPR Factors affecting blood pressure  Vessel diameter o Constriction of blood vessels increases TPR o Dilation decreases TPR  Blood viscosity o Increase in viscosity increases TPR  Total vessel length o The longer the length of vessels, the higher the TPR Control of BP in the brain  The medulla oblongata houses both cardio regulatory center and respiratory regulatory center  Receptors in blood vessels and in CNS send signals to these centers to maintain homeostasis Blood Pressure Regulation  Baroreceptors o Regulate BP o Sense changes in pressure