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

State in brief about the macronutrients, State  in brief about the Macronut...

State  in brief about the Macronutrients  Each element is specific in its function in plant metabolism, however, the exact functions for a number of them are still not known. T

Digestion, Adsk question #Minimum 100 words accepted#saliva enzyme

Adsk question #Minimum 100 words accepted#saliva enzyme

What is circulation, What is circulation? Circulation is the movement o...

What is circulation? Circulation is the movement of substances as nutrients and gases within blood vessels and cavities all by the organism.

Explain the acquired deficiency of the vitamin k metabolism, Why are some t...

Why are some types of hemorrhagic diseases caused by genetic or acquired deficiency of the vitamin K metabolism? Lack of vitamin K predisposes to hemorrhages as this vitamin i

Describe briefly about vitamin B2, Vitamin B 2 (Riboflavin) Riboflavin...

Vitamin B 2 (Riboflavin) Riboflavin is a yellow to orange-yellow, crystalline powder of faint odour and intensely bitter taste. Its solubility in water is very slight and depe

Define bioactive substances from protein foods, Define Bioactive Substances...

Define Bioactive Substances from Protein Foods? Bioactive substances are derived from living organisms that can be used by humans for a variety of applications. They are consti

Respiratory system, describe the structure of a lung in terms of covering m...

describe the structure of a lung in terms of covering membranes and cavities

Mention causes of implant failure due to restorative problem, Mention cause...

Mention causes of implant failure due to restorative problems. 1) Restorative problems: a) Excessive cantilever. b) Use of implants with rigid prosthetic connection with

How can asexual reproduction in planarias be described, How can asexual rep...

How can asexual reproduction in planarias be described? Planarias can separate themselves asexually by transversal bipartition because of the great regeneration capability of t

Define components of total parenteral nutrition, Define Components of Total...

Define Components of Total parenteral nutrition? Glucose: Initiated at the rate of 6 mg/kg/min and increased upto 12-1.4 mg/kg/min, but care to be taken to prevent hyperglyce

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