The organelle that breaks down cell compounds into small particles that the cell can use is the lysosome.

Here's why:

* Lysosomes are the "recycling centers" of the cell. They contain powerful enzymes that can break down various cellular components like:

* Worn-out organelles

* Debris

* Bacteria

* Viruses

* The breakdown products are then released back into the cell to be reused.

Let me know if you have any other questions!