IMG_0023 - t > need more P to keep blood moving....

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BP Measurement: To measure the BP, the cuffis inflated ) artery constricted F no Q (P cuff> P artery ) artery closed off). As the P cuffgradually released, Q resumes, but now it is turbulent F audible sounds (because the vessel is partially constricted): first sound: systolic pressure (120 mm Hg). When the artery is completely operq the sounds disappear : diastolic pressure (80 mm Hg), because smooth flowing blood does not create sound. There are two values for the diastolic pressure: First: when the sound starts to muffIe Second: when the sound disappears FACTORS THAT ABFECT BP 1. Peripheral Resistance 2. Vessel Elasticity 3. Blood Volume 4. Cardiac Output Peripheral Resistance Blood cells and plasma encounter R when they contact the vessel walls. If R
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Unformatted text preview: t > need more P to keep blood moving. The sources of peripheral resistance: a. Vessel diameter As the diameter ofvessel .l. ) more fluid is in contact with walllRt>Pt Sympathetic vasomotor fibers innervate muscle layer ) norepinephrine : vasoconstrictor F vasoconstriction >BP t B I ood*b orne vas o constri ct or s'. Sympathetic nervous system activated ) adrenal medulla ) epinephrine BP J > kidneys ) renin ) angiotensin II* Blood Volume I or Blood osmolartiy f ] hypothalamus ] vasopressin (ADH)" *also act together on kidney to cause the reabsorption of salt and water ) blood volume and BP f gL...
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This note was uploaded on 12/14/2011 for the course PHYS 345 taught by Professor Dr.abdirkin during the Spring '11 term at St. Thomas FL.

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