Water Balance
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13.2.06
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- Overview of Water Balance
- intake - 90% ingested water; 10% metabolic water
- output - 60% urine; 28% lungs/skin; 12% sweat/feces
- water need - trigger thirst & release of ADH
- The Thirst Mechanism
- decrease in plasma volume OR increase in osmolarity -----> excitation of hypothalamic thirst center -----> sensation of thirst
- Regulation of Water Output
- obligatory water loss - lungs, sweat, feces
- regulation of water - kidneys (ADH -> Na+)
- Disorders of Water Balance
- dehydration - water loss > water intake
- bleeding, burns, sweating, diuretics
- hypotonic hydration - too much water or Na+
- edema - accumulation of water in interstitial space
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Category: Physiology Notes
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