Ch. 8 Water & Minerals (pt.1)
Ch. 8 Water & Minerals (pt.1) NTR 213-04
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This 3 page Class Notes was uploaded by Kahlia Baines on Sunday November 1, 2015. The Class Notes belongs to NTR 213-04 at University of North Carolina - Greensboro taught by Laurie Allen in Fall 2015. Since its upload, it has received 34 views. For similar materials see Introductory Nutrition in Natural Sciences at University of North Carolina - Greensboro.
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Date Created: 11/01/15
Ch.8 Water & Minerals Study Guide (part 1) Kahlia Baines Dietary Supplements- USP Seal USP Seal – The supplement contains what it says it contains. PURE & SAFE. Water in the body: 60% of body weight 75% muscle weight is water 25% weight of bone due to water 2/3 intracellular (inside cells) 1/3 extracellular (outside cells) Cell membrane- Permeable to water. Water crosses the membrane by osmosis. Osmosis- The diffusion of water in a direction that equalizes the concentration of dissolved substances on either side of a membrane. Water is overlooked but an essential nutrient. * Water Distribution: Intracellular and Extracellular. Water is found: Blood, lymph, spaces between cells (not water tight, can pass through). The cell membranes that separate the intra cellular: Inside- Affected by blood pressure and the force generated by osmosis. Outside- Located in blood and lymph, the water between cells, and the water in the digestive tract, eyes, joints and spinal cord. Blood pressure- forces water from the capillary blood vessels into the spaces between the cells of the surrounding tissues. Distribution of water- (in & out), Depend on differences in the concentrations of dissolved substances, or solutes such as proteins, sodium, potassium, and other small molecules. Solutes- Dissolved substances. Water Balance The amount of water in the body remains relatively constant over time. Water cannot be stored in the body water intake and output must be balanced to maintain the right amount. Most fruits and vegetables are over 80% water, and even roast beef is about 50% water. Most liquids we drink contain SOME water. To maintain water balance, intake from food and drink and water produced by metabolism must equal water output from evaporation, sweat, urine, and feces. Increases in temperature or activity increase evaporative losses; increasing water consumption proportionately increases urinary excretion. Every day about 9 L (38 cups) of fluid enters the gastrointestinal tract, but more than 95% of this is absorbed before the feces are eliminated.
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