CELLS ALIVE! / SCIENCE PHOTO LIBRARY CELLS ALIVE! / SCIENCE PHOTO LIBRARY
Human Sperm. Sperm are some of the most active cells in the body, their motility responsible for getting them to the site of an ovum for fertilization. Colourized clip shows their rapid whip-like movement, as well as their morphology: head with enclosed DNA, midpiece, and tail or flagellum.
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