2006-09-09 23:16:48 · 5 answers · asked by Anonymous in Health ➔ General Health Care ➔ Other - General Health Care
LEAD -The central nervous system (CNS) is the primary target for many serious air pollutants, such as lead, which is a major environmental hazard. Research over the past 10 years has provided evidence that levels of lead exposure associated with central nervous system effects, particularly as manifest in behavioral changes, is far lower than previously realized. Fifteen years ago, blood lead concentrations in children were not considered problematic until they exceeded levels greater than 30 to 40 micrograms per deciliter ('g/dL). Since that time, more sophisticated epidemiological studies have demonstrated changes in cognitive function at blood concentrations as low as 10 to 15 'g/dL. While children are more susceptible to lead's CNS effects, adults exhibit similar deficits in learning and memory as well. Advanced aging is also a period when enhanced vulnerability to the toxic effects of lead are predicted. In Germany, a large study documented an age-related decline in bone lead concentrations with advancing age. This effect was more pronounced in women than in men, reflecting post-menopausal processes in women which contribute to bone resorption and the release of lead back into the bloodstream. These results mean that lead exposure is actually increased during a period of already heightened susceptibility due to concurrent degeneration of other physiological functions, including both CNS and renal functions.
2006-09-09 23:26:45 · answer #1 · answered by uknative 6 · 1⤊ 0⤋
Even unleaded petrol contains minor amount of lead
2006-09-10 18:52:30 · answer #2 · answered by Dr.Varun indiafivestar@yahoo.com 2 · 0⤊ 0⤋
lead
2006-09-11 20:30:09 · answer #3 · answered by rajan naidu 7 · 0⤊ 0⤋
lead
2006-09-10 01:00:49 · answer #4 · answered by FIGHTER 2 · 0⤊ 0⤋
lead and radio active
2006-09-09 23:33:01 · answer #5 · answered by Anonymous · 0⤊ 0⤋