NURSING EXAM QUESTIONS
TOXICOLOGY
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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lead
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arsenic
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cambium
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mercury
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Detailed explanation-1: -Many of the neurotoxic effects of lead appear related to the ability of lead to mimic or in some cases inhibit the action of calcium as a regulator of cell function. At a neuronal level, exposure to lead alters the release of neurotransmitter from presynaptic nerve endings.
Detailed explanation-2: -Lead ions poison proteins throughout the body, blocking their normal function. The enzyme 5-aminolaevulinic acid dehydratase (ALAD) is composed of eight subunits, each poisoned by two lead ions (gray spheres) in this structure. Lead ions are not used by our cells, but they pose a constant danger to them.
Detailed explanation-3: -Children mainly get lead poisoning by swallowing and/or absorbing lead-based paint used in houses that were built before 1978. Lead paint gets into children’s systems when they: Eat or touch peeling paint chips and flakes that contain lead. Put their hands, toys and other items covered with lead dust in their mouths.