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BPK 110 (91)
Lecture 7


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Biomedical Physio & Kines
BPK 110
Matthew White

BPK 110Lecture 7AOverview of Water and MineralsAshes to ashes and dust to dust When life force leaves the body all that is left behind is a mall pile of ashes minerals5 pounds of mineralsCarbs proteins fats vitamins and water are present at first but they soon disappear7 Major minerals essential mineral nutrients found in the human body in amounts larger than 5gCalciumPhosphorous PotassiumSulphurSodiumChlorideMagnesium 4 Trace Minerals essential minerals found in the human body in amounts less than 5gIronZincCopperIodineWater60 of body weightIncorporated into molecules cells tissues organsActive in many cell reactionsIs the most indispensable nutrient Main FunctionsSolvent for AAs minerals glucose proteins etcWaste disposal eg Urea from protein breakdownLubricant Shock absorption Body temperature maintenance Body cooling eg Sweat evaporation Water BalanceDehydration negative balanceWater intoxication positive balancePer Calorie or Kcal spent 115 millilitersof water is neededEg Expending 2000 caloriesday23 litres of water neededIncrease water needs with alcohol consumption diabetes activity hot climate high fibre salt or sugar diet diuretics pregnancybreastfeeding diarrhea vomiting fever surgery burns blood loss young or old ageWater QualityHard water vs soft wateroHard water has more calcium and magnesiumoSoft water the principle ion is sodium which may aggravate hypertension and it dissolves contaminant metals more easily eg Iron cadmium leadBottled water in CanadaoBest choice is water rich in calcium and magnesium but low in sodiumSalts compounds composed of charged particles dissolved in water eg Sodium ChlorideIons electronically charged particles like NaElectrolytes ions dissolved in water that carry an electrical currentoSalt on surface like on zucchini draws out the waterFigure 83 How electrolytes govern water flowo1 With equal numbers of dissolved particles on both sides of a waterpermeable divider water levels remain equalo2 When additional particles are added to increase the concentration on side B particles cannot flow across the divider o3 Water can flow both ways across the divider but tends to move away from side A to side B where there is a greater concentration of dissolved particles The volume of water increases on side B and the concentration on sides A and B become equalAcid and Base Balance
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