Status report on space medicine in the United States.
D015502:Absorptiometry, Photon; D000328:Adult; D000337:Aerospace Medicine; D002320:Cardiovascular Physiological Phenomena; D018504:Ecological Systems, Closed; D004702:Endocrine Glands / Q000502:physiology; D004781:Environmental Exposure; D006400:Hematocrit; D006801:Humans; D007109:Immunity; D008297:Male; D009132:Muscles / Q000378:metabolism; D009424:Nervous System Physiological Phenomena; D005082:Physical Exertion; D012119:Respiration; D012863:Skeleton / Q000502:physiology; D013026:Space Flight; D014481:United States