Lecture 4-3notes

Lecture 4-3notes - 1 BIO 203 Salt and water balance...

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Unformatted text preview: 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 Fuids move? Convection (mass Fow/bulk Fow) E.g., circulatory system Characteristics luid, constituents move together in coordinated manner Driven by pressure gradient: P 1-P 2 = P Salt and water balance Bulk Fow/mass Fow/convection All constituents move together Driven by pressure gradient: P 1-P 2 = P M = P 1 P 2 [ ] General form of Fux equation M = rate of Fow = Generalized conductance factor Salt and water balance Bulk Fow/mass Fow/convection All constituents move together Driven by pressure gradient: P 1-P 2 = P M = P 1 P 2 [ ] Q = r 4 8 L P 1 P 2 [ ] General form of equation Poisesuilles Law : Fow through pipe with circular cross-section 2 Salt and water balance Relation between salt and water balance How do fuids move? Convection (mass fow/bulk fow) Fluid, constituents move together Driven by pressure gradient: P 1-P 2 = P Osmosis Osmosis Denition: diusion o water down osmotic gradient across a semipermeable membrane Diusion is the independent movement o individual molecules down a concentration or energy gradient Unlike mass fow, no relation o movement o water and movement o solutes Osmosis Denition: diusion o water down osmotic gradient across a semipermeable membrane Driving orce: = in...
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Lecture 4-3notes - 1 BIO 203 Salt and water balance...

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