L18-Thirst

L18-Thirst - Neural Regulation of Thirst Body Fluid...

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Neural Regulation of Thirst Body Fluid Compartments o 67%: Intracellular fluid o 33%: Extracellular fluid 26% Interstitial fluid: in between cells 7%: Intravascular fluid (Plasma) <1%: Cerebrospinal fluid Osmotic Pressure / Movement of Water o Isotonic: Equal concentration; no osmotic pressure o Hypertonic: Higher concentration outside of cell; osmotic pressure draws water out of the cell o Isotonic: Higher concentration inside the cell; osmotic pressure draws water into the cell Water Balance o Positive free water balance: hypotonicity o Negative free water balance: Hypertonicity Osmometric Thirst o Tendency to seek and ingest water due to an intracellular vs. extracellular (interstitial) fluid imbalance. o Osmolality: concentration of solutes in body fluids o Osmometric thirst does not rquire intravascular plasma loss Induced by ingestion (eg, salt) and sweating o Stimulated by osmoreceptors
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L18-Thirst - Neural Regulation of Thirst Body Fluid...

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