PUBH 1515 Public Health Week 8 Chapter 9 Water

PUBH 1515 Public Health Week 8 Chapter 9 Water - Chapter 9...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 9 Water • The average human uses 75 gallons of water per day. • The average top loading washer machine uses 46 gallons of water per load • The human body at birth is 97% water. • Part of the aging process is dehydration (IVD for example). • By age of 65 some individuals water content is 60% to 70%. • Some 3/4 of the world is covered by water. • Human blood mineral content is almost identical to the ocean water mineral content. • When the blood is too concentrated, the hypothalamus initiates impulses that stimulate drinking behavior. The brain and the kidneys govern • Water excretion. The hypothalamus senses when the blood's sodium concentration is too low or blood volume or blood pressure is too low. • Good clean water = Looks good, tastes good and is safe short and long term. • Potable Water = Looks good, tastes good and is free from harmful substances. • Safe Water = Is safe from disease causing items but does not look good or taste good. • Turbidity = Refers to amount of solids suspended in the water. • Contaminant = Anything in water which is not water. So minerals are contaminants, but may not be dangerous. • Contaminated Water = Refers to water with poisonous materials in it. It may look safe to drink, but may be dangerous. • Polluted Water = May or may not be contaminated, but it has a taste, smell or look which is unpleasant. It may be safe to drink. • Private well water is usually not chlorinated or cleansed, so the 40 million Americans who drink water from wells are especially likely to encounter microorganisms in their water. Diseases Spread Through Water Supply • Many organisms prevalent in the world are: 1. Typhoid 2. Cholera 3. Hepatitis 4. Dysentery • Lack of clean water is the single greatest threat to mankind today. • The Committee on Recommended Dietary Allowances (RDA) recommends that under normal dietary and environmental conditions adults should consume between 1 and 1 1/2 milliliters of water for each calorie spent in the day. For the person who extends about 2,000 calories a day, this works out to 2 to 3 liters, or about 6 to 8 cups. Water intoxication is the rare condition in which body water content is too high. Symptoms are headache, muscular weakness, and lack of concentration, poor memory, and loss of appetite.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
• Water is classified according to its hardness or softness that describes the mineral content within the water. • Water classified as hard: 1. May have a taste (metallic) 2. Will not lather well with soap 3. Leaves ring around the tub or sink 1. Has high calcium and magnesium concentrations 2. • Water classified as soft: 1. Found in most cities within U.S. 2. Is associated with increased rate of heart disease and hypertension 3. Has a high sodium concentration 4. Makes more bubbles with less soap • Water classified according to location: 1. Surface water = Lakes, ponds, and streams are more likely to be contaminated. It is easily contaminated by acid rain; runoff from highways; pesticide, fertilizer,
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/19/2011 for the course PHYS 1501 taught by Professor Mercynavis during the Summer '10 term at Life Chiropractic College West.

Page1 / 7

PUBH 1515 Public Health Week 8 Chapter 9 Water - Chapter 9...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online