An epithelium that has several layers, with an apical layer of flattened cells, is called (choose all that apply): a. ciliated, b. columnar, c. stratified, d. simple, e. squamous.

Video transcript

Welcome back. Let's look at our next question. What will an epithelium with four layers of boxlike cells be called a simple squamous epithelium. B stratified squamous epithelium, C simple cuboidal epithelium or D stratified cuboidal epithelium. So we can see looking at our answer choices that we have kind of two descriptors, simple versus stratified and squamous versus cuboidal. Well, even just using logic, if we didn't recall off the top of our head, um boxlike will probably match up with cuboidal box and cube. And indeed boxlike cells would be cuboidal, meaning they're square as tall as they are wide when you look at them, when we talk about squamous cells. So squamous are flat sheet like cells. So that's the difference between those two terms and then simple and stratified by stratified. Well, we're talking about our questions asking us what it would be called if it had four layers, I think of like strata and geology and stratified does mean having more than one layer of cells stacked on top of each other, whereas simple would mean just a single layer of cells. So with that in mind, if we have four layers and are boxlike we're talking about choice D stratified cuboidal epithelium layers of cells stacked on each other boxlike in shape. So our other answer choices, of course, we can rule out choice. A it's not simple squamous squamous as that would be a single layer of flat she sheet like cells. It wouldn't be choice B stratified squamous stratified is correct. But these are cuboidal, not squamous. And then finally choice C, simple cuboidal right shape but simple cuboidal epithelium would have only one layer. So that's why choice C isn't correct. And those stratified cuboidal epithelium are found in high abrasion areas because you've got these sturdy cells and multiple layers. So that's where you would find them in the body. But again, the epithelium four layers, boxlike cells choice D is our answer. Stratified cuboidal epithelium. See you in the next video.