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 3: 'I Donât Need to Worry â HIV/AIDS Only Infects Gay Men'. This couldn't be further from the truth. HIV is transmitted through an exchange of body fluids, specifically semen, vaginal fluids, breast milk, blood or pre-ejaculatory fluids. Most men become HIV-positive through sexual contact with other men.
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.