chapter 8 - CHAPTER 8 WATER MINERALS"THE ASHES LEFT BEHIND...

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CHAPTER 8 WATER & MINERALS “THE ASHES LEFT BEHIND ARE THE MINERALS, A SMALL PILE THAT WEIGHS ONLY ABOUT 5 POUNDS .” (p.270)
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WATER Makes up about 60% of a person’s body weight Without water cells die Water brings the exact ingredients the cell requires and  carries away the end products Nearly universal solvent: Dissolves aa, glucose, minerals,  and others .  Fatty substances are specially packaged  w/water soluble proteins Lubricates digestive tract and tissues, joints Helps maintain body temperature
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WATER BALANCE REMEMBER THIRST LAGS BEHIND LACK OF WATER WATER OUT=WATER IN DEHYDRATION and H20 INTOXICATION When blood is too concentrated  lost H20, but not salt , the molecules and  particles in blood attract water out of salivary glands, and the mouth gets  dry. Blood too concentrated or blood volume too high or blood pressure too low  hypothalamus sends signal to the brain to register thirst and signals to the  pituitary to release a hormone that causes the kidneys to conserve water Hypothalamus monitors  concentration in blood Kidneys respond to NA+ concentration in blood and secrete regulatory  substance.  The more H20 the body needs, the less it excretes Drink H20 throughout the day  Alcohol and caffeine are DIURETICS
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How Much Water Do I  Need to Drink in a Day? DRI meets  80% of day’s need for water Men: 13 cups of fluid from beverages and drinking  water Women: 9 cups of fluid from beverages and drinking  water Remaining water need is met from consumed foods Body produces water from the breakdown of energy- yielding nutrients 
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Water Balance
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TWO TYPES OF WATER HARD WATER Ca+ and Mg+ Leaves ring in tub Gray residue in wash
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