4.1 Cell Communication

Describe the ways that cells can communicate with one another.

• Cells communicate with one another through direct contact with other cells or from a distance via chemical signaling.

Explain how cells communicate with one another over short and long distances.

• Cells communicate over short distances by using local regulators that target cells in the vicinity of the signal-emitting cell.
• Signals released by one cell type can travel long distances to target cells of another type.