00:01
So if we consider our answer choices, one of the best ways to approach in this question is to consider how each of these cell kind of categories works.
00:12
So we have the epithelial layer that we're considering, connective tissue, muscle, and nervous tissue.
00:22
A good way to look at all these tissues combined is to consider the skin where all of these are present.
00:28
So at the top of skin, we have a very small epithelial layer.
00:33
We have a binding network, which we call the connective layer, because it connects the epidermis, the epithelial layer, to what's underneath.
00:43
We have our muscle layer, which is used to move our bones and our whole arms and appendages, according to how the muscle layer contracts and extends.
00:56
And we have a nervous kind of feeding network to these muscles.
01:02
So the epithelial layers are basically just a covering of skin cells or dead cells or living cells, create a barrier for things so they can't get through.
01:17
There's not much in this layer other than the cells themselves because skin cells specifically have keratin, which keeps water and other substances from getting through...