BIOS 20188 Lecture Notes - Lecture 20: Molality, Body Fluid, Extracellular Fluid
3 Apr 2020
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Lecture 4: calculate the volumes in the various fluid compartments of the body. Calculate: . 6 x weight of individual = total water in individuals body. Osmolality = concentration of solute found in water. Osmolality x total body water = total concentration of solute in body. Solute cannot move from icf to ecf freely (osmolarity reg is via water) Solute and water move thru ecf parts allowing for volume and osmotic equilibrium. Calculate body water compartments: icf = x tbw ecf = x tbw: describe the changes in extracellular and intracellular osmolality and volume following the six different types of volume contraction and volume expansion. Osmotic regulation : kidneys respond in changes in osmolarity by retaining and excreting water. Ex: hyperosmolarity-- retain water to decrease heightened osmolarity. Volume regulation : kidneys respond to volume changes by retaining or excreting. Ex: high volume excretion of sodium followed by excretion of water decrease in volume (indirect approach)
