{'fraction_non_alphanumeric': 0.019966722129783693, 'fraction_numerical': 0.004991680532445923, 'mean_word_length': 4.96039603960396, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Studies on the Physiology of the Trachea

When discussing ciliary beat frequencies in general, as a means of measuring ciliary cell activity, the results given must always be regarded as rough mean values. Little is known at present about the background of these variations, but extracellular as well as intracellular factors may be responsible. The following extracellular factors seem to be of most importance: 1) Variations in the thickness of the layer of mucus covering the cilia; 2) Variations in the tonus of the smooth muscles of the submucosal layer; and 3) Variations in the mucus viscosity.