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.
Electron micrograph of the human immunodeficiency virus. HIV/AIDS denialists dispute the existence of HIV or its role in causing AIDS. HIV/AIDS denialism is the belief, contradicted by conclusive medical and scientific evidence, that human immunodeficiency virus (HIV) does not cause acquired immune deficiency syndrome (AIDS).