Given the task definition and input, reply with output. Given a scientific passage and an answer, generate a question for the given answer.

Passage: Cells, like these nerve cells, do not work in isolation. To send orders from your brain to your legs, for example, signals pass through many nerve cells. These cells work together to perform a similar function. Just as muscle cells work together, bone cells and many other cells do as well. A group of similar cells that work together is known as a tissue. Answer: nerve cells
When orders are sent from your brain to your legs, these signals pass through what type of cells?