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III9 - Circulatory Physiology III Factors Affecting Blood...

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Circulatory Physiology III. Factors Affecting Blood Pressure A. Cardiac Output ( = stroke volume X heart rate) CO = SV (ml/beat) x HR (beats/min) = 70 ml/beat x 60 beats/min = 4200 ml/min 1. increased cardiac output -> increased blood pressure 2. increased stroke volume -> increased blood pressure 3. increased heart rate -> increased blood pressure B. Peripheral Resistance 1. arteriole constriction ---> increased blood pressure 2. resistance inversely proportional to the "fourth power" of the radius change C. Blood Volume 1. hemorrhage - decrease in blood pressure 2. salt/fluid - increase in blood pressure 3. polycythemia - increase in blood viscosity 4. RBC anemia - decrease in blood viscosity IV. Regulation of Blood Pressure A. Nervous System Control 1. control of arteriole diameter 2. directs blood flow to proper organs and tissues that need it 3. REFLEX PATHWAY: baroreceptors/chemoreceptors/brain --> afferent nerve fibers --> medulla (vasomotor center) --> vasomotor (efferent) nerve fibers --> smooth muscle of arterioles B.
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