What structure helps a cell move around?

The structure that helps a cell move around is flagella. Flagella are long, whip-like appendages that protrude from a cell's body and enable it to propel itself through its environment. They rotate or undulate, allowing the cell to swim effectively, which is especially important in fluid environments. Cells with flagella can move toward nutrients or away from harmful substances, thus aiding in survival and functioning within their ecosystems.

Cilia, while also involved in cell movement, usually cover the entire surface of a cell and beat in coordinated waves to create movement or push substances along a surface rather than providing propulsion through a fluid. Pseudopods are temporary projections of the cell's cytoplasm used primarily by certain types of cells, such as amoebas, for movement and feeding but are not as efficient as flagella for swimming. Vesicles, on the other hand, are membrane-bound sacs within the cell that transport materials but do not contribute to the movement of the cell itself.