HLTC23H3 Study Guide - Persistent Organic Pollutant, Mercury Poisoning, Water Pollution

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Lecture 5: factors influencing child growth: february 6, 2012. Environment (see diagram: genetic factors, endocrine system, cultural factors, environmental factors. Bergmann"s rule: populations in colder climates are generally larger, with wider torsos/stockier stature, since reduced surface area relative to body weight limits heat loss. Those in warmer climates are more slender, increasing surface area relative to weight to maximize heat loss. Allen"s rule: populations in colder climates will have shorter arms and legs relative to height (to limit heat loss), while those in warmer climates will have longer arms/ legs. However, improved nutrition, particularly in tropical regions, is now reflected in weaker climate-body size relationship than in the past. Requires higher rate of basal metabolic rate and robs body of energy that could be used for growth. More than 25 million people live in high altitude regions (>3000 m above sea level): andes, ethiopia, himalayas, tibet, nw u. s.

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