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.
HIV stands for (human immunodeficiency virus) There are five stages of progression of HIV to AIDS to Death: Stage 1 - initial transmission and infection with HIV. Stage 2 - infection without presention of signs or symptoms (may last 10 or more years) Stage 3 - signs and symptoms of HIV begin to appear.