Blood flow

- can be expressed by the following equation:

„ ,. , Mean arterial pressure — Right atrial pressure

Total peripheral resistance (TPR)

where:

Q = flow or cardiac output (ml/min) AP = pressure gradient (mm Hg) R = resistance or total peripheral resistance (mm Hg/ml/min)

- The equation for blood flow (or cardiac output) is analogous to Ohm's law for electrical circuits (I = V/R), where flow is analogous to current and pressure is analogous to voltage.

- The pressure gradient (AP) drives blood flow.

- Thus, blood flows from high pressure to low pressure.

- Blood flow is inversely proportional to the resistance of the blood vessels.

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