cell cycle

G₁ Stage

Cell volume increases; cell differentiation/growth completed; cell begins to function

G₀ Stage

Stage outside the cell cycle in which cells do not copy their DNA and do not prepare to divide; many cells, such as mature nervous cells in the human body, are in this stage; may last weeks or indefinitely

S Stage

DNA Replication occurs; all cell activity ceases as replication is completed; the onset of the S Stage is triggered by a buildup of the hormone “S-Cyclin”

G₂ Stage

Cell function resumes; cell increases in volume as all cell contents double in preparation for cell division

M-Stage

Mitosis occurs followed by Cytokinesis; triggered by the buildup of the hormone       “M-Cyclin” 

Mitosis

specifically the formation and segregation of chromosomes and division of the nucleus; occurs in 4 stages: Prophase, Metaphase, Anaphase, Telophase;

Cytokinesis

 the physical division of the cell membrane and cell contents into 2 cell