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 One. Myth: AIDS is mostly an African problem. Fact: Of the 42 million people around the world who live with HIV/AIDS, 70% are in sub-Saharan Africa. HIV/AIDS exists and is spreading in Africa in a socioeconomic context created by western colonialism and, more recently, western trade and economic policies.
The Origin of AIDS and HIV May Not Be What You Have Learned . Most people believe that the origin of HIV, the AIDS virus, derives from some natural evolutionary event. Key among these HIV origin theories is the so called âcut hunter theoryâ in which a human, allegedly African native, received a bloody wound or infected splash while preparing a chimpanzee carrying a similar virus (i.e., SIVcpz).