title: Space medicine.
abstract: How does the human body adapt to conditions of weightlessness, and are the changes reversible?
authors.affiliation: Johnson Space Center, Houston, TX 77058, USA.
authors.forename: P C
authors.initials: PC
authors.lastname: Johnson
mesh_terms: D000222:Adaptation, Physiological; D000337:Aerospace Medicine; D018480:Astronauts; D018488:Bone Demineralization, Pathologic / Q000503:physiopathology; D018495:Fluid Shifts / Q000502:physiology; D006801:Humans; D009133:Muscular Atrophy / Q000503:physiopathology; D013026:Space Flight; D018489:Space Motion Sickness / Q000209:etiology / Q000503:physiopathology; D014481:United States; D018557:United States National Aeronautics and Space Administration; D014893:Weightlessness / Q000009:adverse effects*; D018544:Weightlessness Countermeasures