The sac formed around a large particle to allow a cell to take it in or remove it is called a phagosome.

Here's a breakdown:

* Phagocytosis: This is the process where a cell engulfs large particles, such as bacteria, cell debris, or even other cells.

* Phagosome Formation: When a cell encounters a large particle, it extends its cell membrane to surround the particle. This membrane then pinches off, forming a closed sac called a phagosome. The phagosome then travels through the cell's cytoplasm.

* Digestion: The phagosome fuses with a lysosome (another type of cellular organelle), which contains digestive enzymes. The enzymes break down the particle's contents, allowing the cell to utilize the nutrients or eliminate the waste.

Let me know if you have any other questions!