Physiology · USMLE Step 1

USMLE Physiology Equations

Core physiology equations (cardiac output, Starling forces, clearance, Fick) as cloze cards with variable definitions on the back.

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Cardiac output (CO) is defined as ____
HR × SV
The Fick equation expresses cardiac output as ____
VO2 / (CaO2 - CvO2)
Mean arterial pressure (MAP) can be estimated using ____
(systolic + 2 × diastolic) / 3
Systemic vascular resistance (SVR) is calculated as ____
(MAP - CVP) / CO × 80
Pulmonary vascular resistance (PVR) is calculated as ____
(PAP - PCWP) / CO × 80
Poiseuille equation expresses flow rate as proportional to ____
directly proportional to r^4 and pressure gradient; inversely proportional to length and viscosity
Compliance (C) is defined as the change in volume divided by ____
delta-V / delta-P
Elastance is ____
1 / C
The net filtration force across a capillary depends on ____
capillary hydrostatic pressure, interstitial hydrostatic pressure, capillary oncotic pressure, and interstitial oncotic pressure
The Starling equation for filtration rate is Qf = ____
Kf × [(Pc + π_i) - (P_i + π_c)]
Glomerular filtration rate (GFR) measured by clearance equals ____
(U_substance × V) / P_substance
Effective renal plasma flow (eRPF) is calculated using the clearance of ____
PAH (para-aminohippuric acid) clearance
Renal blood flow (RBF) equals ____
RPF / (1 - hematocrit)
Filtration fraction (FF), normally about 20 percent, is calculated as ____
GFR / eRPF
The Nernst equation determines the equilibrium potential for an ion using ____
61 mV / z × log([out] / [in])

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