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.
Human immunodeficiency virus (HIV) facts. 1  HIV is the virus that causes HIV infection and the acquired immunodeficiency syndrome (AIDS). 2  Anal or vaginal sexual intercourse and illicit injectable drug use commonly transmit HIV. 3  Infected mothers may also transmit HIV to their child during pregnancy or breastfeeding.