Biology! Help Please!...prevention of mitosis...cells dividing freqently! please help!?

Both nerve cells and heart muscle cells remain in G1 of interphase. In contrast, cells that line the intestine divide frequently. Discuss this difference in terms of why damage to the nervous system or heart (by a stroke or heart attack) is so dangerous? What might happen to the lining of the intestines if you take a drug or had a disorder that prevented mitosis?