Factors Affecting Blood Pressure
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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
- Increased cardiac output -> increased blood pressure
- Increased stroke volume -> increased blood pressure
- Increased heart rate -> increased blood pressure
Peripheral Resistance
- Arteriole constriction ---> increased blood pressure
- Resistance inversely proportional to the "fourth power" of the radius change
Blood Volume
- Hemorrhage - decrease in blood pressure
- Salt/fluid - increase in blood pressure
- Polycythemia - increase in blood viscosity
- RBC anemia - decrease in blood viscosity
Tags: Circulation, BP
Category: Physiology Notes
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