what are the parts of a cell and how do they work
- Each part of a cell completes a certain function for the cell. All cells include the following parts: 1  Cell Membrane - forms the outer boundary of the cell and allows only certain materials to move into or out of the cell.  Cytoplasm - a gel-like material inside the cell; it contains water and nutrients for the cell. What are the parts of a animal cell and what they do? 1 Cytoplasm - a gel-like material inside the cell; it contains water and nutrients for the cell. 2  Nucleus - directs the activity of a cell; it contains chromosomes with the DNA. 3  Nuclear Membrane - separates the nucleus from the cytoplasm.  Endoplasmic Reticulum - moves materials around in the cell.