Why is it important for signal transduction systems to trigger a rapid response within a cell and be able to be shut down quickly?

-All signal transduction cascades are shut down immediately so as to prevent the cell from mounting a response.

-Cells are unable to respond quickly to hormones, and therefore signal transduction cascades always occur over a long time.

-Cells have to be able to function alone, because they are unable to work together in a coordinated fashion.

-Cells often have to respond very quickly to changes in their internal and external environments.