Cilia.
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Cilia and flagella are hair-like structures found on cells that wave in a coordinated manner to move particles or propel the cell. Cilia are shorter and more numerous, while flagella are longer and usually occur singly or in pairs. Both cilia and flagella play important roles in cell motility and moving substances across various tissues in the body.
The cell with little hair-like structures that wave to move particles is called a ciliated cell. Cilia are hair-like structures that beat in a coordinated manner to help move fluid or particles along the cell's surface.
In a longitudinal wave, particles move back and forth in the same direction as the wave is traveling. This means that the particles oscillate parallel to the direction of the wave.
When particles move up and down with a wave, this is known as vertical or transverse wave motion. In this type of wave, particles move perpendicular to the direction in which the wave is traveling. This motion creates crests and troughs in the wave pattern.
The particles of a transverse wave move perpendicular to the direction of the wave. As the wave passes through a medium, the particles move up and down or side to side in a direction that is perpendicular to the direction of the wave propagation.
In a sound wave, particles move back and forth in the same direction as the wave travels, while in a water wave, particles move in a circular motion.