Nutrition-WATER - Chapter 12 Water & Introduction to...

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1 Chapter 12 Water in Your Body • Intracellular – 2/3 of total body water – Within the cells – High in potassium and phosphate • Extracellular – 1/3 of total body water – Interstitial • Between the cells • High in sodium and chloride – Plasma – Water of skin and bones Functions of Water • Carries nutrients and waste products • Maintains molecular structure • Participates in chemical reactions • Serves as solvent for compounds • Acts as a lubricant and cushion • Aids in regulation of body temperature • Maintains blood volume Water, water, everywhere • 60% of adult’s body weight • 75% of infant’s body weight – Water = 75% weight of lean tissue – Water = <25% weight of fat People with less lean tissue have smaller proportions of water – females, obese, elderly Water Intake Intake Influenced By • Thirst – Mouth becomes dry – Blood concentrates – Hypothalamus sends signals to drink • Satiety – Stretch receptors in stomach signal stop – Heart receptors monitor blood volume
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2 Water Output > Water Input = Dehydration 1-2% Loss Thirst, fatigue, weakness 3-4% Loss Poor performance, dry mouth, flushed, impatient, apathetic
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This note was uploaded on 04/20/2008 for the course NHM 101 taught by Professor Baker- during the Spring '08 term at Alabama.

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Nutrition-WATER - Chapter 12 Water &amp; Introduction to...

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