Nonmembrane organelles within the cells include microtubules and microfilaments. They form a framework called the cytoskeleton, which reinforces the cell s shape and functions in cell movement. The cytoskeleton is constructed from at least three types of fiber microtubules, microfilaments, and intermediate filaments. A special arrangement of microtubules is responsible for the eating of the flagella and cilia. Cilia normally occurs in large number on the cell surface.
Flagella are the same length in diameter but longer.
These are responsible for locomotive appendages that protrude from some cells. Many unicellular organisms are propelled through water by cilia and flagella. The outer shell of each is cell is made up of a plasma membrane. The membrane at the boundary of every cell that acts as a selective barrier, thereby regulating the cell s chemical composition. Every cell uses all components, no one piece can make the cell function alone.