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NTR 109 WATER_MINERALS OUTLINE (LECTURE 6)

NTR 109 WATER_MINERALS OUTLINE (LECTURE 6) - Lecture6...

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Lecture 6 Water & Minerals Water 0. 50% - 70% of body weight 1. Muscle   contains 73 % water  0. Fat contains ~20 % water 2. Intracellular fluid 1. Fluid inside the cells  - 2/3 of all body fluids  3. Extracellular fluid 2. Fluid outside the cells- 1/3 of all body fluids  Fluid  Balance 0. Water shifts freely in and out of cells – permeable to water  1. Controlled by electrolyte concentration : able to conduct an electrical current  :mineral that has an electrical charge +, -  2.  Osmosis – passage of water through semi permeable membrane from area of  high water potential ( outside of the cell) to an area of low water potential  3.  Intracellular water volume  0. Depends on intracellular potassium and phosphate concentrations 4. Extracellular water volume  1. Depends on extracellular Sodium and Chloride concentrations
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Functions of Water Water requires a lot of energy to change the state 1L -> 600 kcal 5. Body Temperature regulation  2. Water absorbs excess: heat  3. Body secretes fluid via perspiration(sweat)  4. Skin is cooled as perspiration evaporates 6. Removal of body waste via urine  5. Urea excretion ( Urea: major boy waste product ->product of protein  metabolism)  6.  Sodium excretion 7. Avoid concentrated urine 7. Amniotic(fluid that surrounds fetus, shock absorber)  fluid, joint lubricants, saliva,  bile  Are You Drinking Enough? Ion institute of medicine 0. Recommended as a starting point: *  9  cups for women  *  13 cups for men 4-12 cups of fluids for replace daily water losses  Thirst Mechanism 0. Not reliable 1. Concerns for infants, older adults, athletes  2. Athletes 0. Weigh before and after training session 1. Consume 3 cups for every pound lost 
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3. Illness (vomiting, illness, fever)  Ignoring the Thirst Signal 8. Shortage of water increases: fluid conservation  9.  Antidiuretic hormone  8. Released by the pituitary gland 9. Forces kidneys to conserve water (reduce urine flow) 10. Aldosterone  10. Responds to drop in blood pressure 11. Signals the kidney to retain sodium (water) ( water always follows  sodium) Hydration 11. Loss of 1%-2% of body weight in fluid 12. Thirst Signal  12. Loss of 2% or more of body weight causes muscle weakness 13. Lose significant strength & Endurance  13. Loss of 10%-12%   14. Heat intolerance, body weakness, sluggishness, problems with balance  14. Loss of 20%  15. Coma, Death  Too Much Water 4. Overburden the kidneys 5.
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