The endoplasmic reticulum transports materials within the cell. Ribosomes produce proteins, which are packaged by the Golgi apparatus so that they can leave the cell. Mitochondria generate energy for the cell's activities. Lysosomes contain enzymes that can break down particles entering the cell. For example, certain white blood cells engulf bacteria, which are then broken down by enzymes in lysosomes.
Centrioles participate in cell division.
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