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Major Physiology Equations and Factoids

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Blood Flow/Airflow (Q)

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Terms in this set (53)

Blood Flow/Airflow (Q)

Q = DeltaP/R

DeltaP = Pressure gradient
R = Resistance

Translate Flow equation to Equation for Cardiac Output

CO = (MAP + RAP)/TPR

Cardiac Output = (Mean Arterial Pressure - Right Atrial Pressure)/(total peripheral resistance)

Velocity of Flow

v = Q/A

Q = Flow
A = Cross Sectional Area

Pouseuilles Law for Resistance

R = 8(viscosity)L/(pi*radius^4)

L = Length

Thus vessel RADIUS is most important determinant of resistance. Decrease in radius by 2 --> increases resistance by a factor a 16 and thus decreases flow by a factor of 16 (Q = deltaP/R)

Resistance in Parallel vs Series

- Addition of additional units decreases total Resistance for which?

- 1/R(parallel) = 1/R1 + 1/R2 + ...
- R (series) = R1 + R2 + R2

Addition of units arranged in parallel (organs or collateral artery addition) reduces total resistance.