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BIO 241 1st Edition Lecture 26Outline of Last Lecture I. Tubular reabsorption of waterII. Negative feedback control of ADHIII. Countercurrent multiplier and exchangerIV. Tubular secretionV. Renal clearanceVI. Summary of nephron functionsVII. Urine drainage from the kidneysVIII. Urinary bladderIX. UrethraX. Micturition reflexOutline of Current Lecture II. Body fluid compartmentsIII. Fluids are in constant motionIV. Fluid balance and waterV. Water gain and lossVI. Regulation of fluid intake (thirst)VII. Regulation of fluid outputCurrent LectureII. All body fluids account for 60% of total body weight. Of this 60%, intracellular fluid accounts for 67% of water weight. Extracellular accounts for 37%. 80% of this is interstitial fluid and 20% is plasma. III. Semi-permeable membranes separate the fluid compartments which helps with the constantmotion of fluid. They move constantly between the three compartments. Fluid is the concept of human homeostasis that the amount of fluid lost from the body is equal to the amount of fluid taken in. Osmosis is the primary mechanism by which water moves from one compartment to the next. The pressure gradient controls osmosis and therefore controls fluid balance. IV. Fluid balance, then, means water balance, and it implies electrolyte balance as well – the two are inseparable. Water makes up 45 – 75% of total body weight, the exact percentage depending upon: age – newborn = 75%, lean adult man = 60%, old age = 45%body size – obese = as little as 45%, very lean as much as 75%These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.gender – lean adult man = 60%, lean adult women = 50%V. Water that is loss and gained equals 2,500 mL/day. Water gain is preformed water and metabolic waste. Water loss is sensible and insensible.


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UNCW BIO 241 - Fluids

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