NFS 230 Lecture Notes - Lecture 12: Oral Rehydration Therapy, Extracellular Fluid, Fluid Balance
15 Nov 2016
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Document Summary
Makes up 75% weight of lean tissue. Proportion is smaller in females, elderly and obese since theres less lean tissue. Water in body fluids: carries nutrients and waste throughout body, maintains structure of large molecules, metabolism, solvent for minerals, vitamins, aminos, glucose, lube and cushion, regulate temp, maintain blood volume. Thirst and satiety influence intake in response to the mouth, hypothalamus and nerves. Blood becomes concentrated, mouth is dry and hypothalamus makes u drink. Dehydration occurs when water output exceeds input. Body water contents are too high in all body fluid compartments. Also occurs with kidney disorders that reduce urination. Decreased sodium concentration due to excessive water. Obligatory water excretion: min amount of water the body has to excrete each day to dispose of its waste. Water is lost via urine, from lungs as vapor, from skin as sweat, as feces. Water needs vary depending on diet, activity, temp, humidity. 2-3 liters for someone who eats above 2000 kcal.
