Select the correct statement regarding epithelia.
a. Simple squamous epithelia consist of tall, narrow cells.b. Simple epithelia form impermeable barriers to viruses.c. Stratified squamous epithelia are present where protection from abrasion is important.d. Pseudostratified epithelia consist of at least two layers of cells stacked on top of one another

The correct statement about epithelia is stratified squamous epithelia are present where protection from abrasion is important (option C).

Explanation:

Epithelia, or epithelium, is a set of cells in close relationship that fulfill the function of covering the external and internal surfaces of an organism, as with the skin and mucous membranes of the organs, respectively. These cells can join to form one or several layers, and together they are called epithelial tissue.

Of the options given, the third stratified squamous epithelia is present where abrasion protection is important is true, taking as an example the skin, which protects the internal tissues against any wound or abrasion.

The other options are not true because:

The simple squamous epithelium is formed by flat cells, not tall and narrow cells.
The simple epithelium, such as the vascular endothelium, does not constitute a barrier against viruses.
The pseudostratified epithelium has only one layer of cells that, being disordered, appear to form several layers.

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