# Physio Equations

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1. Cardiac Output
CO= HR x SV
2. Darcy's Law of Bulk Flow
BF= P/R
3. Resistance
1/r^4
4. Velocity of BF
Flow (CO)/ cross-sectional area
5. Stroke Work
SW= SV x MAP
6. Mean Arterial Pressure
MAP= CO x TPR
7. Pouiselle's Law
BF= P (viscosity/n4)
8. Resistance (w/i organs)
Series

R1+ R2 + R3
9. Resistance (b/w organs)
Parallel

1/R1+ 1/R2+ ....
10. Heart Rate (EKG)
60/# beats
11. Compliance
C= V/P
12. Mean Arterial Pressure
MAP= diastolic + 1/3 (pulse presure)
13. Pulse Pressure
PP= Systoli- diastolic (~40)
14. Reynold's
VDp/n

velocity x diameter x density / viscosity
15. Laplace's Law
P= 2T/r
16. Net Filtration
Jv= k[Pc-Pif]-[pic-pif]
17. Ejection Fraction
EF= SV/EDV
18. Fick's Principle
CO= O2 consumption/ (O2 pulm vein - O2 pulm art)

• Pulm vein= peripheral artery (ex: brachial)
• Pulm artery= systemic mixed venous blood
19. Stroke Volume
SV= EDV-ESV
GFR x P
21. Excretion Rate
UV
22. Reabsorption
(GFR x P) - (UV)
23. Secretion
(UV)-(GFR x P)
24. Renal Plasma Flow
RPF=(Upah x Vpah)/(Ppah)
25. GFR
PUF x Kf

PUF= (PGc-Pbs)-piGc
26. Clearance
C=UV/P

(inulin, or ~creatinine)
27. Fractional Excretion
FE= C / GFR x 100
28. Fractional Reabsorption
100- FE
29. Free H2O Clearance
CH2O=VCosm
30. Net Flux
Jx= PA( Xo-Xi)

+ = movement into cell
31. Daltons Law
760 (%) + 760 (%)...
32. Nernst
-60log(xi/xo) = cations

• Na+ = 59
• Cl= -46
• K= -83
33. Driving Force
DF= Vm- Em

+ = driven out of cell

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 Author: sketch112 ID: 140863 Filename: Physio Equations Updated: 2012-03-11 14:15:46 Tags: sgu Folders: Description: sgu Show Answers:

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