HLSC 2P91 Lecture Notes - Lecture 7: Ferrous, Body Fluid, Veganism
5 Feb 2016
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Document Summary
Tissue type- lean tissue have higher fluid content than fat. Age- lean tissue is lost with age and body fluid is lost with. Gender- males have more lean tissue and therefore more tissue it body fluid. Electrolytes: minerals dissolved in water: sodium, potassium, chloride, phosphate. Carry electrical charges: sodium and potassium are positively. Chloride and phosphate are negatively charged- anions. Fluids overall have a neutral charge due to balances between charges- cations electrolytes. In intracellular fluid, k and hpo42- are the predominant electrolytes. Roles: action potential (electrochemical gradient involving na and k) Need to control: total body water, water location (ratio) Losses: ~60% through excretion, ~30% through thermoregulation, Some situations require attention (illness, injury, diuretics, physical activity, environment, pregnancy, lactation. Intake: driven by thirst, sensed by hypothalamus (concentration of electrolytes in the blood, blood volume via blood pressure) Kidneys: central to fluid maintenance, functional unit is nephron. Regulated by a family of hormones (adh, rennin)
