title: Alveolar pathways during 90-foot, breath-hold dives.
abstract: The gas tensions of mixed expired and alveolar air were measured at various depths during descent and ascent. A reversed carbon dioxide gradient from the lungs into the blood was demonstrated at the 50-foot depth. At 90 feet, 45 percent of the pre-dive carbon dioxide content of the lungs had disappeared. There was no indication of a reversed oxygen gradient during ascent.
mesh_terms: D002245:Carbon Dioxide; D019069:Cell Respiration; D004242:Diving / Q000502:physiology*; D006801:Humans; D010100:Oxygen; D012119:Respiration / Q000502:physiology*
chemical_list: D002245:Carbon Dioxide; D010100:Oxygen
keywords: DIVING/physiology; RESPIRATION/physiology