Poison Biography

standard toxic symbol, as defined by Directive 67/548/EEC.]]In the context of biology, poisons are substances that can cause damage, illness, or death to organisms, usually by chemical reaction or other activity on the molecular scale, when a sufficient quantity is absorbed by an organism. Paracelsus, the father of toxicology, once wrote: "Everything is poison, there is poison in everything. Only the dose makes a thing not a poison."In medicine (particularly veterinary) and in zoology, a poison is often distinguished from a toxin and a venom. Toxins are poisons produced via some biological function in nature, and venoms are usually defined as biologic toxins that are injected by a bite or sting to cause their effect, while other poisons are generally defined as substances which are absorbed through epithelial linings such as the skin or gut. Terminology Some poisons are also toxins, usually referring to naturally produced substances, such as the bacteria proteins that cause tetanus a

Source: http://en.wikipedia.org/wiki/Poison
 

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