Section 5.1 Summary • The Cell Cycle
Cells have distinct phases of growth, reproduction, and normal functions. The cell cycle has four main stages: G1, S, G2, and M. The length of the cell cycle can vary, resulting in different rates of cell division. This variability is based on the body's need for different cell types. Cells also divide because they need a sufficient surface area-to-volume ratio to move materials into and out of the cell.