Lecture 6 outline

Lecture 6 outline - Biology 2A03 Lecture 6 Signal...

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Biology 2A03 Lecture 6 Signal transduction
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2 Osmosis Water diffusion: although water is polar it has high permeability in membranes due to its small size Flux can be increased by H 2 O concentration depends on Total [solute] in solution determines 1 mole of dissolved particles = e.g. 1M of glucose in solution = but 1M of NaCl = The higher the osmolarity of a solution the Osmosis in the direction of
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Hypertonic: Hypotonic: Isotonic: Fig 4-19 Cells are very permeable to water and impermeable to many solutes Extracellular fluid has the same # of osmoles of nonpenetrating solute Extracellular fluid has a greater # of osmoles of nonpenetrating solute Extracellular fluid has the lower # of osmoles of nonpenetrating solute 300 mOsm 400 mOsm 200 mOsm
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Compare to osmolarity Relates the osmolarity of a solution relative to normal extracellular fluid without regard to penetrating or nonpenetrating nature of solutes A solution can be isoosmotic at 300 mOsm but hypotonic due to penetrating solutes isoosmotic But hypotonic 300 mOsm >300 mOsm
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This note was uploaded on 06/21/2011 for the course BIO 2A03 taught by Professor Tba during the Spring '10 term at McMaster University.

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Lecture 6 outline - Biology 2A03 Lecture 6 Signal...

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