00:01
Which of these gives the correct sequence of levels of organisation? okay, so we have five options, and let's look at our levels of organisation.
00:11
We have organ system, chemical, tissue, organ, cell.
00:16
So which of these is going to be the smallest to start with? well, it's going to be two, the chemical.
00:23
So a chemical is a single molecule, tiny.
00:27
For example, water or glucose.
00:29
So that's definitely the smallest.
00:31
Next smallest will be the cell.
00:36
So the chemicals are, of course, inside the cell.
00:39
The cell also has lots of other stuff.
00:41
If you think of an animal cell, since we're looking at organs and stuff, then it will have the nucleus, and it will have mitochondria, all sorts of stuff.
00:50
But it's still only second smallest.
00:53
Because next we go up to a tissue.
00:55
So a tissue is a collection of cells of the same type.
01:01
With a purpose, with a shared purpose.
01:08
So mostly the same type, shared purpose, not too complex, not an organ, so it's simpler than an organ, but they do have a purpose together...