​What is Pathology - How are cells that are quiescent induced to divide?

​What is Pathology - How are cells that are quiescent induced to divide? 
Cell division is induced by a series of events that comprises numerous steps:
-Growth factor binding to a plasma membrane receptor with tyrosinase kinase activity 
- Activation of the receptor with tyrosinase kinase activity 
- Signal transmission via metabolic processes and secondary messengers like calcium ions & Nuclear transcription factor activation 
- The cell's entry into the cell cycle