Explain hayflick limit and why are hela cells able to live beyond the hayflick limit?

The Hela cells live beyond the Hayflick limit due to the secretion of telomerase in the Hela cells.

Explanation:

Hayflick limit is the number of times a cell divides by mitosis, due to  the continuous shortening of the telomeres at the end of the chromosomes. It only apply to normal living cells.

Hela cells are human cancerous cells found in the cervix or the entrance of the uterus. They cause cervical cancer as they grow uncontrollably, affecting other cells around it.

The Hela cell survive the hayflick limit because it produces a hormone called telomerase, that continuously elongates the telomeres of the chromosomes, for continuous cell division.