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.
HIV Myth 2: 'HIV and AIDS Are the Same Thing'. Absolutely not. HIV is the virus that infects a person and attacks the immune system. AIDS is the disease that develops later in people with HIV that remain untreated or don't respond to treatment.
In North America, AIDS is blamed on the health effects of unprotected anal sex and poppers on homosexual men, an argument which does not account for AIDS in drug-free heterosexual women who deny participating in anal sex. In this case, HIV/AIDS denialists claim the women are having anal sex but refuse to disclose it.