Cytoplasm
The cytoplasm is a jelly-like substance that is found in all cells. It allows substances such as food and oxygen to be transported around the cell. Many activities of the cell take place in the cytoplasm.
Nucleus
The nucleus is found in the cytoplasm. It is a very important part of a cell. It controls everything that happens inside the cell.
There are thread-like structures in the nucleus. They contain information on how the cell should function.
Cell membrane
The cell membrane is a soft and thin layer that surrounds the cytoplasm. This membrane holds the cytoplasm inside it. It also controls the substances that go into or out of the cell.