Cells in the human body may move simply by changing shape, according to recent studies. The movement is attributed to something similar to a bag of liquid suddenly favoring one side and rolling toward it. In the case of a cell, it actively participates in the shaping that causes it to be propelled.
Single celled organisms also can move through the use of cilia, tiny hairs which give it traction and have motility, or flagella, which are more limb-like protrusions.
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