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Sophistication in Our Nervous System |
| Section: NATURAL SCIENCE / AT THE EDGE |
| Author: Joseph W. Alper |
| Publication: The world & I online |
| Issue Date: 2/1/1986 |
| Size: 2,536 Words, 15,765 Characters |
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The feature that most distinguishes an animal from a plant is that animals have nervous systems that enable them to process internal and external information, integrate it quickly, and act on it. At the core of the nervous system are the neurons--millions of them. An individual neuron can do little by itself but, connected with others, it becomes part of a complex data-processing system. And neuroscientists, as part of their quest to decipher the inner workings of this most animal of systems, have striven over the past fifty years to understand how nerve cells function and communicate among themselves.
The knowledge they desire lies ultimately in the molecules nerve cells use to recognize and communicate with each other. At the microscopic level, one type of nerve cell is hard to...
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...lopment correlates with an increase in the binding rates of membrances containing the molecules. "This embryonic-to-adult conversion is a clear-cut example of the local surface modulation that we had predicted," says Edelman. Although there are already three known CAMs and more will undoubtedly be found, and modulation of CAM expression will remain a major mechanism for neural selectivity.
(806 of 15,765 characters)
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