Explain about the zinc toxicity, Biology

Assignment Help:

Explain about the Zinc Toxicity?

Only a few occurrences of acute zinc poisoning have been reported. The toxicity signs are nausea, vomiting, diarrhoea, fever and lethargy and have been observed after ingestion of 4-8 g (60-120 mmol) of zinc. Gross acute zinc toxicity has been reported after consuming water stored in galvanized containers. Symptoms include nausea, vomiting and fever. These symptoms are observed after ingestion of 2g or more of zinc. Long-term zinc intakes higher than requirements could, however, interact with the metabolism of other trace elements. Copper seems to be especially sensitive to high zinc doses.

A zinc intake of 50 mg/day (760 μmol) affects copper status. Because copper also has a central role in immune defence, these observations should be studied further before large-scale zinc supplementation programmes are undertaken. Any positive effects of zinc supplementation on growth or infectious diseases could be offset by associated negative effects on copper-related functions. Intakes between 25 -50 mg zinc per day have been reported to interfere with metabolism of both iron and copper. FAONHO 2004 therefore recommended the upper level of zinc intake for an adult man at 45 mg/day (690 μmol/day) and extrapolated to other groups in relation to basal metabolic rate. For children, this extrapolation means an upper limit of intake of 23-28 mg/day (350-430 μmol/day), which is close to what has been used in some of the zinc supplementation studies. Except for excessive intakes of some types of seafood, such intakes are unlikely to be attained with most diets. Adventitious zinc in water from contaminated wells and from galvanized cooking utensils could also lead to high zinc intakes.

 


Related Discussions:- Explain about the zinc toxicity

What is hemorrhage, What is Hemorrhage Mild to moderate capillary ooze...

What is Hemorrhage Mild to moderate capillary ooze can readily be controlled by pressure packing. A more severe venous or, in rarer instances, an arterial bleed may require cl

Explain regulatory enzymes, Explain Regulatory enzymes Regulatory enzy...

Explain Regulatory enzymes Regulatory enzymes:   Citrate  synthase,  isocitrate  dehydrogenase  and a-ketoglutarate dehydrogenase complex are the key  enzymes which  regulate

What is green fluorescent protein, Q. What is green fluorescent protein (GF...

Q. What is green fluorescent protein (GFP)? Green fluorescent protein is a protein which is found in a luminescent jellyfish (Aquorea victoria) that lives in cold waters of nor

State the terms complete alimentary tract, State the terms complete aliment...

State the terms complete alimentary tract, complete digestive tract and complete gut? A digestive tract which has an anal and oral opening. This adaptation allowed for a linear

Explain the stages in taxonomic procedures - alpha taxonomy, Explain the St...

Explain the Stages In Taxonomic Procedures? Divided into three levels or phases: 1) Alpha (α) phase, 2) Beta (β) phase, 3) Gamma (γ) phase. Alpha Taxonomy The

Population parameters and regulation, Population Parameters and Regulation ...

Population Parameters and Regulation Population can be defined as a group of organisms of same species occupying a specific area at a particular time, such as all the deer or

Types of parthenocarpy, Types of Parthenocarpy Three types of Partheno...

Types of Parthenocarpy Three types of Parthenocarpy are generally recognized: Genetical Environmental, Chemically-induced. Genetical Parthe

What is the formation of atherosclerosis plaques, Which of the following le...

Which of the following leads to the formation of atherosclerosis plaques? -uptake of oxidized LDL particles by macrophase -non specific interactions between LDL particles

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd