# Shared Flashcard Set

## Details

Cardiology terms
PA school physiology
10
Physiology
10/17/2009

## Additional Physiology Flashcards

Term
Definition
 lie on the arterioles of several vascular beds, when activated, cause constriction
Term
 arterioles
Definition
 site of highest resistance to blood flow
Term
 velocity of blood flow
Definition
 V = Q/A; where V= velocity, Q = flow (ml/sec), A = cross-sectional area (cm2)
Term
 blood flow
Definition
 Q = (change in P)/R; where Q = flow (ml/min), P = pressure gradient(mmHg), R = Resistance (mmHg/mL/min)
Term
 TPR
Definition
 aka SVR, measured by using blood flow equation, using cardiac output as Q, difference in pressure between the aorta and the vena cava as change in P
Term
 Poiseuille equation
Definition
 R = 8nl/pi x r ^4; where n =viscosity of blood, l = length of blood vessel, r ^4 = readius of blood vessel raised to the fourth power
Term
 Relationship between viscosity and resistance
Definition
 directly proportional
Term
 Relationship between length and resistance
Definition
 directly proportional
Term
 Relationship between fourth power of the radius and resistance
Definition
 inversely proportional; if the radius of a blood vessel decreases by one half, resistance increases by 16-fold
Term
 series resistance
Definition
 the total resistance of the system arranged in series is equal to the sum of the individual resistances
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