Epithelial Tissues Have Polarity, with an Apical Side That Faces

question 18

Multiple Choice

Epithelial tissues have polarity, with an apical side that faces the environment and a basolateral side that faces the interior of the animal. Because of the harsh environmental exposure on the apical side, epithelial cells have a short life span of 2- 6 days. Which of the following is the most likely reason that the tissue as a whole does not wear away, despite the short life spans of the cells?

• A) The epithelial tissue is unusually thick.
• B) The tissue has cells that actively undergo mitosis and cytokinesis to replace the lost cells.
• C) The degraded tissue is recycled and restored to its original site.
• D) New cells are transported in the blood to the site where old cells have worn away.

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