Post 6: Chapter 3 Question 15

Cell division is extremely important during the body's growth period. But when an organ is severely damaged, the lolst cells cannot be replaced and in return is permanently damaged. Most cells undergo mitosis until the end of puberty, when adult body size is reached and overall body growth ends. After this time, only certain cells routinely divide. Other cells almost completely lose thier ability to divide when they are fully mature and become amitotic. The cells cannot be replaced by the same type of cells. This is why the heart, for example, becomes weaker and weaker after a heart attack or injury. In conclusion, an organ is permanently damaged after it has been through an injury because the organ does not have the ability to divide and reproduce new cells to repair the damage.