Questions: mylab.pearson.com Homework 3 Software Downloads I (Fall 2024) Question Part A Select the correct statement regarding epithelia. Pseudostratified epithelia consist of at least two layers of cells stacked on top of one another. Stratified epithelia are tall, narrow cells. Stratified epithelia are present where protection from abrasion is important. Simple epithelia form impermeable barriers.

The answer is the third one: Stratified epithelia are present where protection from abrasion is important.

Explanation for each option:

1. Pseudostratified epithelia consist of at least two layers of cells stacked on top of one another.

   • This statement is incorrect. Pseudostratified epithelia appear to have multiple layers due to the varying positions of the nuclei within the cells, but in reality, all cells are in contact with the basement membrane, making it a single layer.

2. Stratified epithelia are tall, narrow cells.

   • This statement is incorrect. Stratified epithelia refer to multiple layers of cells, not the shape of the cells. The shape can vary, but the key characteristic is the multiple layers.

3. Stratified epithelia are present where protection from abrasion is important.

   • This statement is correct. Stratified epithelia, such as stratified squamous epithelium, are found in areas subject to abrasion, like the skin, because the multiple layers provide protection.

4. Simple epithelia form impermeable barriers.

   • This statement is incorrect. Simple epithelia consist of a single layer of cells and are typically involved in absorption, secretion, and filtration, rather than forming impermeable barriers.

In summary, stratified epithelia are designed to protect against abrasion, making the third statement the correct choice.