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Lecture 4-3notes - BIO 203 Salt and water balance Salt and...

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1 BIO 203 Salt and water balance 9/25/2010 • Remember: exam on Monday Next lecture after today: Wednesday, 9/29 Bring your calculator! Salt and water balance Relation between salt and water balance How do fluids move? – Convection (mass flow/bulk flow) E.g., circulatory system • Characteristics Fluid, constituents move together in coordinated manner Driven by pressure gradient: P 1 -P 2 = P Salt and water balance Bulk flow/mass flow/convection – All constituents move together – Driven by pressure gradient: P 1 -P 2 = P ˙ M = κ P 1 P 2 [ ] General form of flux equation ˙ M = rate of flow κ = Generalized conductance factor Salt and water balance Bulk flow/mass flow/convection – All constituents move together – Driven by pressure gradient: P 1 -P 2 = P ˙ M = κ P 1 P 2 [ ] ˙ Q = π r 4 8 L η Ρਟ Σਿ ΢ਯ Τ੏ Φ੯ Υ੟ P 1 P 2 [ ] General form of equation Poisesuille’s Law : flow through pipe with circular cross-section
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2 Salt and water balance Relation between salt and water balance How do fluids move? – Convection (mass flow/bulk flow) Fluid, constituents move together Driven by pressure gradient: P 1 -P 2 = P – Osmosis Osmosis • Definition: diffusion of water down osmotic gradient across a semipermeable membrane – Diffusion is the independent movement of individual molecules down a concentration or energy gradient Unlike mass flow, no relation of movement of water and movement of solutes Osmosis • Definition: diffusion of water down osmotic gradient across a semipermeable membrane Driving force: π = π in π out π = osmotic pressure
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