1. Flagella: These are long, whip-like structures that propel the cell through its environment. They are typically found in single-celled organisms like bacteria and some sperm cells.

2. Cilia: These are shorter, hair-like structures that beat in a coordinated, wave-like motion to create a current that moves the cell or fluid around it. They are found in many types of cells, including those in the respiratory tract and the lining of the fallopian tubes.