Exs_7.6_(rev) - Blood Pressure Measurements and Vital Signs...

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Unformatted text preview: Blood Pressure Measurements and Vital Signs Exercise 7.6 Blood Pressure Perfusion: adequate flow of blood through the tissues Arterial blood must be under sufficient pressure to overcome vascular resistance Sphygmomanometer: device used to measure BP – Blood pressure cuff Hypertension: high BP Hypotension: low BP Arterial Blood Pressure Dependent on: – Cardiac Output (Q) = the amount of blood pumped by the heart per minute – Peripheral Resistance = resistance of blood flow through the arterioles BP = Q X TPR BP can be raised by vasoconstriction (constriction of arterioles) and lowered by vasodilation (dilation of arterioles) Blood Flow Laminar Flow: all parts of the fluid move in the same direction, parallel to the walls of the vessel – Central stream moves faster than stream against the arteriole walls – Perfectly laminar = no transverse movement, no mixing Turbulent Flow: some parts of the fluid mvoe in radial and circumferential directions; churning and mixing – Causes vibrations of the vessel – Causes sound Measuring BP...
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This note was uploaded on 02/05/2012 for the course BIO BIO 231 taught by Professor Dr.w. during the Spring '11 term at Murray State KY.

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Exs_7.6_(rev) - Blood Pressure Measurements and Vital Signs...

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