What type of cells are considered labile cells?

Labile cells are characterized by their continual ability to divide and regenerate. This includes tissues that undergo constant turnover to replace cells that are lost or damaged. The correct choice highlights epidermal cells found in the skin and the cells lining the lungs, which are responsible for providing protective barriers and facilitating respiratory functions. These cells are in a state of constant renewal due to their exposure to environmental factors and the need to maintain tissue integrity.

In contrast, muscle cells and neurons are classified as stable cells because they do not regenerate at the same rate or do so only under specific conditions. While fibroblasts and endothelial cells do have regenerative capabilities, they do not exhibit the same level of constant turnover as labile cells. Lastly, adipose tissue and cartilage are examples of permanent cells that have very limited regeneration capacity; once these tissues are lost, they are not easily replaced. Thus, the characteristics of the epidermis and lung tissues align perfectly with the definition of labile cells.