Final answer:
Liver cells have a shorter lifespan than bone cells due to exposure to toxins and high metabolic activity.
Step-by-step explanation:
Liver cells have a shorter lifespan than bone cells due to a combination of internal and external factors. One reason is that liver cells are constantly exposed to toxins and waste products, as the liver is responsible for detoxifying the blood. This exposure can lead to cellular damage and a shorter lifespan.
Additionally, liver cells have a high level of metabolic activity, which can also contribute to their shorter lifespan. Metabolism produces reactive oxygen species that can damage cells and shorten their lifespan.
On the other hand, bone cells are not exposed to the same level of toxins and have a lower metabolic rate, which allows them to have a longer lifespan compared to liver cells.