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New Toxicology for Old - A Critique of Accepted Requirements and Methodology (Paperback)
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New Toxicology for Old - A Critique of Accepted Requirements and Methodology (Paperback)
Series: Archives of Toxicology, 5
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Nervous system is in the most cases a likely target for the
untoward effects of chemicals. The harmful consequences affect
primarily the individual but may also considerably strain the whole
society. The consumption of ethanol is a glaring example (National
Institute on Alcohol Abuse and Alcoholism 1978). As ethanol, many
organic liquids have similar immediate effects on the nervous
system. The rapidity of the response suggests the involvement of
the neuronal communication. The nervous system is also vulnerable
to the depletion of oxygen, another common cause for the rapid
deterioration of the brain function. It is quite impossible to list
all the effects produced by the very large number of the individual
chemicals. It would be more fruitful to try to understand the
characteristics of the nervous system and the biochemical toxic
mechanisms in the evaluation of the neurotoxicity of chemicals.
Transfer of Xenobiotics in the Brain The adult central nervous
system displays a functional barrier toward the blood-borne
chemicals so that water-soluble compounds with an approximate
molecular weight above 100 are largely prevented from directly
entering the brain (Bradbury 1979). The functional barrier has
morphological features typical to it and has a very close
association of adjacent capillary cells separated by clefts of 12 A
wide (Jacobs 1978). The nervous system capillaries are enveloped by
glial cell tongues, and these pericytes contain contractile
elements (Le Beux and Willemot 1978a, b) so that the capillaries
can be constricted.
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