PSL301H1 Lecture Notes - Lecture 19: List Of Lakes By Volume, Molality, Lipid Bilayer
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PSL301H1 Full Course Notes
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Factor: muscle/fat ratio: muscle contain lots of h2o; fats contain little h2o. Low muscle: fat ratio (ie more fat: women, people as they age, chronic illness. Vascular (20% of 1/3 of total water volume ~ 7%) Interstitial (80% of 1/3 of total water volume ~ 26%) Water is permeable through lipid bilayer, via aquaporins: proteins in lipid membrane allow water movement, bidirectional movement, determined by solute concentration. Osmolality: # of particles per kg of solvent. Osmolarity: # of particles per l of solvent. ** water will not tolerate areas of different osmolarities** Water will always move in concentration to the gradient (if there are aquaporins available: osmolality in all areas of your body = the same (fact) Water travels from area with low osmolality high osmolality. Sodium: stays in the plasma & interstitium (extracellular space) Potassium: stays in the cellular compartments (intracellular space) Different compartments have the same osmolality: but the dominant, positive ion species differ.
