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.
This fear, coupled with many other reasons, means that lots of people falsely believe: 1  HIV and AIDS are always associated with death. 2  HIV is associated with behaviours that some people disapprove of (such as homosexuality, drug use, sex work or infidelity) 3  HIV is only transmitted through sex, which is a taboo subject in some cultures.