BMS 420 Lecture Notes - Circulatory System, Turbulence, Hydrostatics
Document Summary
Series left heart and right heart, kidney. Arterioles affects local flow or overall bp. Veins changes capacitance thus blood volume, venous return. Venous return corv colv blood flow to brain syncope possible. Driving pressure is difference between downstream and upstream pressures. Q (blood flow) = velocity x cross-sectional area. Can be used for diagnosis of narrowing in a vessel. Narrowed = less cross-sectional area greater velocity. Blood velocity: distance traveled by blood element/unit time. Cardiac output (co) or total blood flow (q) = blood viscosity; l = vessel length. Pressure gradient ( p vs. absolute) relatively constant, r and blood flow change. Transmural pressure ( p across vessel wall) also called radial or distending pressure. Hydrostatic pressure (pgh or pressure head) (due to gravity) Viscosity: measure of the slipperiness between two layers of fluid. Velocity is zero at vessel wall (no slippage) Viscosity is constant* (changes with vessel dimensions and flow rate)
