Answer:
It is observed that
heart cells do not exhibit cell division. Such cells do not divide further and
exit 
phase to
enter an inactive stage called quiescent stage 
of cell
cycle.
Muscle cells when
reach a level of maturity, no longer divide and just perform their function all
through its life. Similar is the case with nerve cells too which are highly
specific and lack the ability to divide once they get specialised. They remain
in that state until they die.
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