coelom. coelom (sÄËlÉm) [ key ], fluid-filled body cavity, found in animals, which is lined by cells derived from mesoderm tissue in the embryo, and which provides for free, lubricated motion of the viscera.oelom. coelom (sÄËlÉm) [ key ], fluid-filled body cavity, found in animals, which is lined by cells derived from mesoderm tissue in the embryo, and which provides for free, lubricated motion of the viscera.
Facts You Should Know. ALS is not contagious. Although the life expectancy of a person with ALS averages about two to five years from the time of diagnosis, this disease is variable, and many people can live with the disease for five years and more. More than half of all people with ALS live more than three years after diagnosis.
ALS is extremely rare, affecting only about two out of every 100,000 people, according to the ALS Association [source: ALSA]. About 5,600 people are diagnosed with the disease in the U.S. each year, and between 20,000 and 30,000 people live with it at any one time [source: ALSA]. What exactly causes ALS isnât known, but researchers are learning more about the disease all the time. In most cases (90 to 95 percent), there is no known cause, and the disease is called sporadic ALS. In the remaining cases (5 to 10 percent), the disease is passed down through families, and is called familial ALS.