Human fetal respiration.
D000653:Amniotic Fluid; D001980:Bronchi / Q000502:physiology; D002860:Chromium Radioisotopes; D004068:Digestive System Physiological Phenomena; D004912:Erythrocytes; D005260:Female; D005333:Fetus / Q000033:anatomy & histology / Q000502:physiology*; D006801:Humans; D008168:Lung / Q000502:physiology; D011247:Pregnancy; D012119:Respiration; D013997:Time Factors
D002860:Chromium Radioisotopes