Word: cilia
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...walls of most of the throat, of the windpipe and its branches (bronchi and bronchioles) are covered with fine, threadlike filaments called cilia, which continually 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...
...animal life reproduced at the Museum there are water fleas, protozoa (single-celled animals), insect larvae, and rotifers. The rotifers, most interesting, give their name to the entire exhibit. The commonest kinds are shaped like tops. The rotifer head is round and surrounded at the flat shoulder with fine cilia which vibrate (in life) so rapidly one after another around the circle of shoulder that the whole body seems to rotate. They are voracious and pugnacious, crouching on a microscopic plant and then swiftly springing at a stray water flea, a protozoa, a bit of leaf...