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venom
Columbia Encyclopedia entry: venom
Venom or zootoxin, any of a variety of poisonous substances produced by animals. In poisonous snakes, venom is secreted in two poison glands, one on each side of the upper jaw, and enters the fang by a duct. Snake venom is a complex substance, containing various enzymes and toxins. Venoms differ in their effect according to the preponderance in them of hemotoxic, hemolytic, or neurotoxic agents. Hemotoxins perforate the blood vessels, causing hemorrhage, and hemolysins dissolve the red blood cells. The venom of the fer-de-lance is chiefly hemotoxic; that of the rattlesnake, the copperhead, and the moccasin is both hemotoxic and hemolytic. Neurotoxins produce paralysis, often of the nerve centers that control breathing, thus causing a quicker death from suffocation. Cobras, coral snakes, scorpions, and spiders produce neurotoxic venoms. The venom of the gaboon viper is both hemotoxic and neurotoxic. Venoms may also contain agglutinins, which promote coagulation of blood, or anticoagulants, which have the opposite effect. The venoms of various snakes have been used medicinally, according to their specific properties, as painkillers (in arthritis, cancer, and leprosy), antispasmodics (in epilepsy and asthma), and blood coagulants (in hemophilia). The venom of the Russell's viper has been used as a coagulant in tonsillectomies and for bleeding gums. The effect of any snakebite necessarily depends on the quantity and kind of toxin it contains, as well as on the resistance of the victim. Immune serum against snake venom, or antivenin, can be prepared by repeatedly injecting sublethal doses of venom into an animal such as the horse. The immune serum thereby produced in the animal can be extracted and used to treat snakebite victims. Poisons are produced by animal species of every phylum; examples include the poison in the rounded warts of the skin of toads, the venoms of spiders, scorpions, bees, and other arthropods, and the poison of jellyfish and other coelenterates. See also toxin.
Wikipedia search results for: Venom
From Wikipedia, the free encyclopedia
Venom is any of a variety of toxins used by certain types of animals. Generally, venom is injected by such means as a bite or a sting. There is a difference between organisms that are venomous and those that are poisonous, two commonly confused terms applied to plant and animal life.
Venomous, as stated above, refers to animals that deliver venom into their prey when hunting or as a defense mechanism.
Poisonous, on the other hand, describes plants or animals that are harmful when consumed or touched. A poison tends to be distributed over a large part of the body of the organism producing it, while venom is typically...more »
Columbia Encyclopedia search results: venom
Results 1 - 10  of 36
  • snakebite

    Snakebite, wound inflicted by the teeth of a snake. The bite of a nonvenomous snake is rarely serious. Venomous snakes have fangs, hollow teeth through which poison is injected into a victim. ...

  • gila monster

    Gila monster, venomous lizard, Heloderma suspectum, found in the deserts of the SW United States and NW Mexico. It averages 18 in. (45 cm) in length, with a large head, stout body, thick tail ...

  • sting

    Sting, in zoology, organ found in bees, many wasps, some ants, and in scorpions and sting rays, used defensively as well as to kill or paralyze prey. In the bee and the wasp the venom is produ...

  • water moccasin

    Water moccasin or cottonmouth, highly venomous snake, Ancistrodon piscivorus, of the swamps and bayous of the S United States. Like the closely related copperhead, it is a pit viper and has a ...

  • Noguchi, Hideyo

    Noguchi, Hideyo, 1876–1928, Japanese bacteriologist, grad. Tokyo Medical College, 1897. He came to the United States c.1900 to work with Simon Flexner at the Univ. of Pennsylvania and in 1904 ...

  • bushmaster

    Bushmaster, large venomous snake, Lachesis muta, of Central America and N South America. It is a member of the pit viper family, which also includes the rattlesnake. The largest New World snak...

  • sea snake

    Sea snake, name for any of the venomous marine snakes of the family Hydrophidae, found in tropical waters of the Indian and Pacific oceans. The sea snake's body is flattened laterally and its ...

  • mamba

    Mamba, name for African snakes of the genus Dendroaspis, in the cobra family. Widely distributed throughout Africa except in the deserts, mambas have extremely toxic venom. When attacking they...

  • solenodon

    Solenodon, venomous insectivorous mammal, genus Solenodon, found in the West Indies. Related to moles, shrews, and hedgehogs, the solenodon resembles a rat with an elongated snout and coarse, ...

  • Alarcón, Pedro Antonio de

    Alarcón, Pedro Antonio de, 1833–91, Spanish writer, politician, and diplomat. He wrote several novels, including El sombrero de tres picos (1874, tr. The Three-cornered Hat, 1891), on which Ma...

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