Mesoderm lining the coelom forms mesothelium. Separation of Peritoneal and Pleural Cavities: In the adult, peritoneal and pleural cavities are separated by the diaphragm. The diaphragm isformed by a septum transversum, paired pleuroperitoneal folds, and somatic mesoderm.
MYTH: AIDS is not caused by HIV. DEBUNKING: This is the biggie, of course. As long ago as 1983, researchers first isolated HIV from people with AIDS. By 1985, they had developed a test showing that the overwhelming majority of people with AIDS have antibodies to HIV in their blood.
Highlights. 1  HIV is a virus that destroys your immune system. 2  AIDS is a condition that is caused by HIV. It is considered the final stage of HIV. 3  Symptoms for HIV and AIDs are different for each person, because the symptoms of each condition come from opportunistic infections.