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Unformatted text preview: WATER Body Composition Body weight is 50-60% water Tissue: blood plasma- 90% water Muscle: 72% water Fat: 20-35% water Functions of Water The “Universal Solvent” No other solvent that can dissolve as many substances All body water contains solutes The medium for chemical reactions Electrolytes have electrical charges Sodium, potassium, chloride Too depleted in electrolytes creates Heart Arrhythmia Acid/Base Solutes give water its acid/base properties Some water dissociates • becomes a hydrogen ion and hydroxyl ion • Ion: charged • Whole molecule is balanced in charge • When broken: 1 half has + charge 1 half has – charge • Hydroxyl Ion: - charge • Hydrogen Ion: + charge Acid/Base Properties • Acid: excess Hydrogen ions H+ o HCl- hydrochloric acid • Base: excess Hydroxyl ions OH- o NaOH- lye • Measured on pH scale 0-14 o 7- Neutral Pure Water- pH 7 o 1-7 Acidic o 7-14-Basic o The extremes are high reactive- burn holes o Blood: 7.4- more basic • It’s important to keep a stable pH with Homeostasis. o If pH is way off, chemical reactions can’t happen Buffers • Absorb the excess of one and release the other one to create balance • Water is a buffer. Used in Biochemical Reactions Product of Respiration Involved in Hydrolysis • Balances charges when molecules are broken Primary transport medium • In the blood. Blood is mostly water • Transports cells, gases, nutrients, metabolic waste Lubrication • Of Saliva, Tears, Synovial Fluids Temperature Regulation •...
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- Spring '08