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.
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.