Flagella and Cilia
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Flagella are long, few-in-number, hair-like structures that move an entire cell; cilia are short and numerous, moving the whole cell or surface substances.
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A single flagellum propels a sperm cell, while dense cilia lining the respiratory tract sweep trapped particles toward the nostrils.
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Despite differing in length and number, both share the same internal "9 + 2" microtubule arrangement.
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