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Silent Killer in the Environment : Part 2
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This lesson deals with Part 2 of the article titled " A Silent Killer in the Environment " published in Science Reporter - December 2018

Ajay Kumar Muchakurthi is teaching live on Unacademy Plus

Ajay Kumar Muchakurthi
Appeared UPSC CSE Mains,M.A.(Public Administration), B.Tech(CSE)

U
Unacademy user
Everytime i listen you i get pumped...awesome sir...
  1. Summary of Science Reporter - December 2018 Presented by Ajay Kumar Muchakurthi


  2. Courses: 3000+ MCQ's from Previous Papers with Analysis Analysis of Daily Current Affairs Daily Current Affairs MCQ's International Relations Summary - Yojana Summary -Science Reporter Indian Polity https://www.unacademy.com/user/ajaykumaro692


  3. A Silent Killer in the Environment: Part 2


  4. Accumulation of Lead in Human System Lead can enter body - Mouth, Nose, Eyes and even through Skin Tetraethyl - can easily enter skin while inorganic - Not easily absorbed Main routes - ingestion and inhalation Adults : 35 to 40% of inhaled lead-Deposited in lungs 95% of it enters bloodstream In case of ingested inorganic lead : 15% is absorbed


  5. Children - Absorption is more efficient Pregnant women, people with deficiencies of Ca, Zn and Fe : Efficient Can lead play any role in human body? Generally, body eliminates lead - Process is very slow Main route Smaller quantities - Faeces, sweat, hairs, nails etc., : Urine


  6. Impacts ofLead on Human Body Lead - Interferes with many enzymes Bound to sulfhydryl groups found in enzymes - in lieu of Ca, Fe and Zn Generally Ca, Fe and Zn as cofactors in enzymatic reaction One such enzyme - Responsible for synthesis of heme Leads interference - results in anaemia


  7. Neurons affected adversely Lead exposure - Damages cells responsible for memory Lead - can pass the blood brain barrier : Substitute for Ca ions Interfere with development of brain and nervous system Lead poisoning Loss of myelin sheaths in neurons Reduces growth of neurons and numbers of neurons


  8. Damage to nervous system - Especially in case of children WHO accepted a new illness : Lead-caused mental retardation Acute poisoning - Abdominal pain, collapse, metallic taste and paralysis may occur Gastrointestinal disturbances, undefined headache, etc. Person may suffer inflammation of mouth and lips etc.,


  9. Symptoms due to lead poisoning - Can be easily missed Diagnosis may veer towards - Appendicitis, encephalitis, etc., in adults In Children - Symptoms may indicate viral gastroenteritis, constipation, iron deficiency, intellectual disability etc., Acute Lead Poisoning - Rare condition Can be caused in two ways: Lead may accumulate in bones, liver, kidneys, brain and muscles and be released suddenly to produce acute condition Large amounts of lead - inhaled at one time


  10. Precautions WHO standard for lead in drinking water : o.oi mg/l Indian standard: 0.1 mq/l How far standards are being implemented? Need to be addressed - Creating advanced facilities for proper monitoring Monitoring of environment - Ideal in areas of lead contamination Random testing of food materials - Regularly Screening of vulnerable population must be carried out


  11. Strong need to raise awareness levels of common masses People - Should be aware of common modes through which lead disperses into environment and its way into human body Lead - Highly toxic metal and strong poison Long term build up - Can be fatal