BP_F10 - Nutritiontrivia What is the most indispensable...

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Nutrition trivia What is the most indispensable nutrient?
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Blood pressure regulation & hypertension
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What is involved? Chapter 12: (pp. 383-391; pp. 394- 400) Water and the body fluids Sodium Chloride Potassium Chapter 18: Hypertension (pp. 618-620)
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Water Makes up about 60% of adult’s body weight Makes up about 75% of lean tissue Makes up <25% of fat Due to lower amount of lean tissue, less water in: Women Obese Elderly
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Functions of water Transport of nutrients and waste Structural maintenance of large molecules (ex: proteins, glycogen) Participant in metabolic rxns Solvent for vitamins, minerals, AA’s, glucose, & other small molecules Lubricant and cushion for joints, inside eyes, spinal cord, amniotic sac Body temperature regulation Maintenance of blood volume
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Water balance Fluid compartments constantly losing and replacing components but composition remains virtually unchanged Water intake and excretion adjusted in response to imbalance
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Water intake Thirst first symptom of dehydration In response to concentrated blood Elderly often fail to perceive thirst
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Water intoxication Rare If excessive water intake or certain kidney disorders Sometimes in endurance athletes Hyponatremia swelling in brain Confusion Convulsions Death
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Water intake recommendations 1.0-1.5 mL/kcal expended AI for total water intake: Men: 3.7 L/day Women: 2.7 L/day
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BP_F10 - Nutritiontrivia What is the most indispensable...

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