 Alzheimer's Disease is a progressive and irreversible brain disease that destroys mental
 and physical functioning  in human beings, and invariably leads to death.  It is the fourth
 leading cause of adult death in the United States.  Alzheimer's creates emotional and
 financial catastrophe for many American families every year, but fortunately,  a large
 amount of progress is being made to combat Alzheimer's disease every year. To fully be able
 to comprehend and combat Alzheimer's disease,  one must know what it does to the brain, 
 the part of the human body it most greatly affects.  Many Alzheimer's disease sufferers had
 their brains examined.  A large number of differences were present when comparing the
 normal brain to the Alzheimer's brain.  There was a loss of nerve cells from the Cerebral
 Cortex in the Alzheimer's victim.  Approximately ten percent of the neurons in this region
 were lost.  But a ten percent loss is relatively minor,  and cannot account for the severe
 impairment suffered by Alzheimer's victims. Neurofibrillary Tangles are also found in the
 brains of Alzheimer's victims.  They are found within the cell bodies of nerve cells in the
 cerebral cortex,  and take on the structure of a paired helix.  Other diseases that have
 "paired helixes" include Parkinson's disease,  Down's Syndrome,  and Dementia Pugilistica. 
 Scientists are not sure how the paired helixes are related in these very different
 diseases. Neuritic Plaques are patches of clumped material lying outside the bodies of
 nerve cells in the brain.  They are mainly found in the cerebral cortex,  but have also
 been seen in other areas of the brain.  At the core of each of these plaques is a substance
 called amyloid,  an abnormal protein not usually found in the brain.  This amyloid core is
 surrounded by cast off fragments of dead or dying nerve cells.  The cell fragments include
 dying mitochondria,  presynaptic terminals,  and paired helical filaments identical to
 those that are neurofibrillary tangles.  Many neuropathologists think that these plaques
 are basically clusters of degenerating nerve cells.  But they are still not sure of how and
 why these fragments clustered together. Congophilic Angiopathy is the technical name that
 neuropathologists have given to an abnormality found in the walls of blood vessels in the
 brains of victims of Alzheimer's disease.  These abnormal patches are similar to the
 neuritic plaques that develop in Alzheimer's disease,  in that amyloid has been found
 within the blood-vessel walls wherever the patches occur.  Another name for these patches
 is cerebrovascular amyloid,  meaning amyloid found in the blood vessels of the brains.
 Acetylcholine is a substance that carries signals from one nerve cell to another.  It is
 known to be important to learning and memory.  In the mid 1970s,  scientists found that the
 brains of those afflicted with Alzheimer's disease contained sixty to ninety percent less
 of the enzyme choline acetyltransferase(CAT),  which is responsible for producing
 acetylcholine,  than did the brains of healthy persons.  This was a great milestone,  as it
 was the first functional change related to learning and memory,  and not to different
 structures. Somatostatin is another means by which cells in the brain communicate with each
 other.  The quantities of this chemical messenger,  like those of CAT,  are also greatly
 decreased in the cerebral cortex and the hippocampus of persons with Alzheimer's disease, 
 almost to the same degree as CAT is lost. Although scientists have been able to identify
 many of these,  and other changes,  they are not yet sure as to how,  or why they take
 place in Alzheimer's disease.  One could say,  that they have most of the pieces of the
 puzzle;  all that is left to do is find the missing piece and decipher the meaning. If
 treatment is required for someone with Alzheimer's disease,  then the Alzheimer's Disease
 and Related Disorders Association(ADRDA),  a privately funded,  national,  non-profit
 organization dedicated to easing the burden of Alzheimer victims and their families and
 finding a cure can be contacted.  There are more than one hundred and sixty chapters
 throughout the country,  and over one thousand support groups that can be contacted for
 help.  ADRDA fights Alzheimer's on five fronts 1- funding research 2- educating and thus
 increase public awareness 3- establishing chapters with support groups 4- encouraging
 federal and local legislation to help victims and their families 5- providing a service to
 help victims and their families find the proper care they need.
