# Shared Flashcard Set

## Details

100
Definitions, Formulas, and Conversions
21
Physics
Professional
09/24/2011

## Additional Physics Flashcards

Term
 P=
Definition
 F/A
Term
 F=
Definition
 P•A
Term
 A=
Definition
 F/P
Term
 Basic flow equation
Definition
 Q=ΔP/R
Term
 ΔP=
Definition
 Q•R
Term
 R=
Definition
 ΔP/Q
Term
 Force is
Definition
 mass • acceleration
Term
 Pressure is
Definition
 force per unit area
Term
 Resistance is
Definition
 opposition to movement
Term
 Forms of ΔP (pressure gradient)
Definition
 P1-P2/time or P1-P2/length
Term
 Flow is
Definition
 volume per unit time
Term
 Poiseuille's Law resistance equation
Definition
 R=8Lη/πr4
Term
 L is
Definition
 length
Term
 r is
Definition
Term
 η is
Definition
 viscosity
Term
 Poiseuille's Law flow equation
Definition
 Q=ΔPπr4/8Lη
Term
 Pressure conversion:mmHg to dyne/cm²
Definition
 MULTIPLY by 1.3 X 10³
Term
 Pressure conversion:dyne/cm² to mmHg
Definition
 DIVIDE by 1.3 X 10³
Term
 Flow conversion:L/min to cm³/sec
Definition
 multiply by 1000/60
Term
 Flow conversion:cm³/sec to L/min
Definition
 multiply by 60/1000
Term
 Frank-Starling Law
Definition
 Muscles compress veins→(↓BP)→more blood back to heart→muscles relay demand for O2 to brain→↑HR→↑sympathetic activity→more filling→more strech→more forcable contraction The Frank–Starling law of the heart (aka Starling's law) states that the stroke volume of the heart increases in response to an increase in the volume of blood filling the heart (the end diastolic volume). The increased volume of blood stretches the ventricular wall, causing cardiac muscle to contract more forcefully. The stroke volume may also increase as a result of greater contractility of the cardiac muscle during exercise, independent of the end-diastolic volume. The Frank-Starling mechanism appears to make its greatest contribution to increasing stroke volume at lower work rates, and contractility has its greatest influence at higher work rates.
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