Here's why:
* Threadlike: Cilia are hair-like structures, thin and elongated.
* Protrude from the surface: They extend outwards from the cell membrane.
* Packed in tight rows: They are typically arranged in a coordinated and organized pattern, often resembling a brush.
Function: Cilia can have various functions, including:
* Movement: They can move fluids or particles past the cell, such as in the respiratory tract where they help remove mucus.
* Sensory: They can act as sensors, detecting changes in the environment, such as in the inner ear where they are involved in balance.
Note: While cilia are similar to flagella, flagella are longer and fewer in number. They are typically used for propulsion, like a tail, while cilia are often used for movement of fluids or sensing.
