NS 132 SQ 13 - Water: Study Questions Synopsis: Initially,...

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Water: Study Questions Synopsis : Initially, we will focus on the physiological role & function of water in the human body followed by an exploration of water balance & its opposite - dehydration. We conclude w/ applied, practical dietary practices for maintaining appropriate water balance or hydration. Textbook readings: Pages 281-288 I. Overview a. Body composition b. Blood plasma c. Muscle d. Fat e. Note Body Composition What proportion of total body weight is water? 50-60% of total body weight is water. What is the major fluid component of blood plasma? Blood plasma is 90% water . If they were of the same total weight, would a relatively fatter person or a relatively more muscular person have more total body water? Does muscle or fat have a higher water content? If they were of same total weight, restively more muscular person would have more total body water than relatively fatter person. Muscle has higher water content than fat. - muscle : 72% - fat : 20-35% ( water : sometimes method of measuring body fat) II. Functions a. Universal solvent b. Acid/base balance [pH values of digestive juices ] c. Use in biochemical reactions d. Transport medium e. Lubrication f. Temperature regulation Function Universal Solvent (most substances dissolved in water) Is body water pure water? What are solutes? No , body water is not pure water. water = universal solvent Water contains solutes, substances dissolved in water (liquid solvent) . solutes : substances/particles dissolved in water ( e.g. electrolytes: charged solutes = ions) Does pure water conduct electricity?
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No , pure water does not conduct electricity. Electrolytes give water electrical prop. ( diff. : water’s polarity split salts) In what medium do biochemical reactions occur? water : medium for biochemical reactions What are electrolytes? What do they do? What are the major electrolytes in the body? electrolytes : substances that separate into ions in water & in turn, are able to conduct electrical current; incl. sodium, chloride, & potassium - Electrolytes w/ electrical charge are dissolved in water What is meant by acid/base balance? What is an acid? What is a base? dissociation : splitting of H 2 O into H + & OH - After molecule dissociation/split : - hydrogen H + ion : (+) charge - hydroxyl OH - ion : (-) charge acid : condition of having excess of hydrogen H + ions ( e.g. battery acid) base : condition of having excess of hydroxyl OH - ions ( e.g. NaOH lye) acid base balance : normal equilibrium bet. acids & alkalis/bases in body; in body, blood is slightly alkaline/basic What is the pH scale? What are values of some common substances? pH scale : measure of degree/concentration of hydrogen ions H + ; ranges from 0 to 14; used to measure pH of a solution. -
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This note was uploaded on 03/29/2008 for the course NUTRI SCI 132 taught by Professor Anderson during the Spring '08 term at Wisconsin.

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NS 132 SQ 13 - Water: Study Questions Synopsis: Initially,...

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