Bio_1A_Lecture_20_Osmoregulation

Bio_1A_Lecture_20_Osmoregulation - Regulating Body Fluid...

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Flatworm Kangaroo Rat Beaver Regulating Body Fluid Composition (Renal Physiology)
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Different organisms deal with their internal/external environment differently theoretical 1:1 relationship Molarity = # moles of solute per liter solution Osmolarity = number of solute particles of substance per liter solution simplest example, 150 mMolar NaCl = 300 mOsmolar NaCl
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Freshwater Fish Saltwater Fish H 2 O NaCl NaCl H 2 O NaCl H 2 O NaCl H 2 O NaCl H 2 O excretion NaCl retention H 2 O retention NaCl excretion Euryhaline animals (salt freshwater) e.g., salmon
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What is DIFFUSION? start equilibrium intermediate imaginary plane
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H 2 O H 2 O What is OSMOSIS? start equilibrium semi-permeable membrane (permeable to H 2 O but not solutes ) Conc 1 > Conc 2 Conc 1 = Conc 2 h osmotic pressure h osmotic pressure (Osmoles/liter) osmotic pressure concentration difference H 2 O moves; solutes do not
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What does OSMOSIS mean for cells? (e.g. RBCs) 300 mOsmoles/L plasma = 300 mOsmoles/L isotonic saline = 150 mM = 300 mOsmoles/L 300 mOsmoles/L normal size normal size ISO tonic swollen cells hypotonic saline = 150 mOsmoles/L 150 mOsmoles/L distilled water = 0 mOsmoles/L Hemolysis HYPO tonic hypertonic saline = 500 mOsmoles/L 500 mOsmoles/L shrunken cells (crenated) HYPER tonic (ISOosmotic) (Hypoosmotic) (Hyperosmotic)
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This note was uploaded on 10/29/2009 for the course BIO biology taught by Professor Meighan during the Fall '09 term at University of California, Berkeley.

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Bio_1A_Lecture_20_Osmoregulation - Regulating Body Fluid...

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