Final answer:
Terminally differentiated cells, such as mature cardiac muscle cells and nerve cells, cease division and remain in the Go phase. These cells provide assistance to neighboring cells.
Step-by-step explanation:
Cells that cease division are called terminally differentiated cells. These cells have exited the cell cycle and have entered a phase called Go. Two examples of terminally differentiated cells are mature cardiac muscle cells and nerve cells. They have stopped producing the active Gā checkpoint kinase and remain in the Go phase indefinitely, providing assistance to their neighboring cells.