Word: alveoli
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Dates: during 1938-1938
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...move, waving their tips with an upward motion. When bismuth powders or pulverized lead glass were blown deep into the lungs of anesthetized cats, Dr. Barclay and his associates found that the dust in dry form remained in the windpipe and its branches, never penetrating into the little sacs (alveoli) which absorb oxygen from the air and eliminate carbon dioxide from the blood. They could see by X-ray the foreign particles moving from the base of the lungs up & out. The movement they discovered was spiral and (viewed from above) clockwise. Particles traveled 1½ inches per minute within...