Animal cells lack cell walls. Eucaryotic flagella are much larger than procaryotic flagella.
Flagella are for motility.
In addition, many eucaryotes have cilia that function like short flagella and are usually used to move substances along the surface of the cell. Eucaryotic flagella are covered with plasma membrane. Unlike procaryotic flagella, eucaryotic flagella move in a whip-like fashion. The cytoplasmic membrane controls the entry and exit of compound from the cell. It is a selectively permeable barrier.