physiostudy1 - flow (CO) Abdominal organs 24% Kidney 20%...

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Overview of the Circulatory System Pressure, flow, & Resistance
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Key Concepts 1. Tissue blood flow can be regulated by changes in: 1. Pressure difference btwn arteries and veins 2. Vascular resistance
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Vocab Portal circulation: blood vessel that flows from 1 capillary bed to another w/o going thru the heart (hepatic, hypophysseal, kidney)
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Overview Continuous closed loop Convective transport = bulk flow Bood consists of blood cells and plasma
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Composition of Bood Formed elements: Erythrocytes (RBCs) Leukocytes (WBCs) platelets Plasma proteins: Albumin Immunoglobins Clotting factors Small molecules: glucose
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Hematocrit Hematocrit = packed cell volume/total blood volume x 100% Males: 45% Females: 42% Total blood in body Cardiac output = 5L/min 2.5L packed 3L plasma
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Blood flow Superior vena cava Inferior vena cava
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Series vs. parallel blood flow Series: A B C Parallel: A C B
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Organs & Percent of total blood
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Unformatted text preview: flow (CO) Abdominal organs 24% Kidney 20% Skeletal muscle 20% Brain 13% Skin 9% Blood flow to lungs?- 5L/min (100%) Relationship btwn pressure, flow, & resistance Flow = volume/ time All fluids exert a hydrostatic pressure any difference in pressure btwn 2 points drives fluid flow Fundamental relationship in hemodynamics: The amnt of fluid movement (ml/min) btwn 2 points depends on the pressure difference and the resistance to flow btwn those 2 points F = P/R Resistance to Fluid flow Factors that contribute to the resistance of fluid flow through a tube: Length of tube (L) Viscosity () of fluid (thickness) Radius of tube (r) Poiseuilles Law R= (8L)/(r^4) Flow= P(/8)(r^4/L) What does this mean? R directly proportional to L and and r^4 Flow inversely proportional to L and...
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physiostudy1 - flow (CO) Abdominal organs 24% Kidney 20%...

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