Term
alpha1 adrenergic receptors 

Definition
lie on the arterioles of several vascular beds, when activated, cause constriction 


Term

Definition
site of highest resistance to blood flow 


Term

Definition
V = Q/A; where V= velocity, Q = flow (ml/sec), A = crosssectional area (cm2) 


Term

Definition
Q = (change in P)/R; where Q = flow (ml/min), P = pressure gradient(mmHg), R = Resistance (mmHg/mL/min) 


Term

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

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


Term
Relationship between length and resistance 

Definition


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 16fold 


Term

Definition
the total resistance of the system arranged in series is equal to the sum of the individual resistances 

