5-7% in heart; 11-13% Arteries; 7% arterioles and capillaries; 60-70% venous system
Capacitance
originates from Venous system – change volume by changing capacitance
Blood Flow
FLUID MECHANICS:
Fluid flow comparable to current flow; i.e. Ohm’s Law
V=IR » D P= Flow X Resistance P=pressure
In a vessel R µ 1/r4 so D P µ Flow x l/r4
R µ length
Clinical Note:
Short, large bore angio-catheters canulated in an antecubital or femoral vein deliver volume faster than a narrow long central line to a central venous site.