00:02
So when we're talking about an organism and what they're made of, we have the smallest level of organization, which would be atoms, and then molecules, and then macromolecules and so on.
00:22
But then we start getting into cells, and cells are organized into tissues, tissues into organs.
00:32
And then we have organ systems and then, you know, eventually you get to an organism.
00:37
So today we're talking about tissues.
00:40
And so tissues are going to be made of cells.
00:43
And some tissues have more cells than others, you know, given their volume.
00:51
And so if we just look at these four pictures here, we have epithelial tissue, which is, you know, depending on where it's located, the cells can actually.
01:01
Actually be really densely packed together.
01:05
For example, in your skin, you have layers and layers and layers of these skin cells that are piled on top of each other, really tightly packed together.
01:21
In your nerves, in your spinal cord, in your brain, you have neurons, which are nerve cells that connect to each other and their cellular bodies have these extensions that reach out and touch the next neuron that's nearby.
01:43
Muscle tissue is created using different muscle cells, which then have fibers that will overlap and work together and pull on each other in order to work.
01:59
Connective tissue is definitely one of the most diverse groups of tissues.
02:06
And you can see here just in this image that the cells are fairly spread apart compared to these other pictures where the cells are really what's making up...
