HUN2201 Chapter Notes - Chapter 9: Blood Donation, Xerostomia, Fluid Balance

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8 Nov 2016
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Fluid balance: fluids gained through consumption and metabolism. As much as 90% of fluids needs met by beverages and food. Metabolic water formed from metabolic reactions contributes 10 14% of the water the body needs each day: thirst mechanism (hypothalamus) prompts us to drink. Increased concentration of salt and other dissolved substances in the blood. A reduction in blood volume and blood pressure, such as during profuse sweating, vomiting, diarrhea, or low fluid intake. Dry mouth and throat from reduced saliva: adh signals the kidneys to retain water, sensible fluid loss. Sweat during exercise or in hot environment. Skin (not sweating) or lungs during exhalation: significant loss. Illness, traumatic injury, blood donation, surgery, exercise, high altitude, low humidity, pregnancy, breastfeeding, diuretics. How much water should we drink: requirements are individualized. Amount needed varies with age, body size, health status, physical activity level, environment.

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