00:01
This question asks us to match each type of defensive cell with its function or description.
00:07
So let's just work through this list and make the pairs.
00:11
All right.
00:12
So for number one, we're looking for a cell type that attacks infected body cells.
00:18
So we know that this must be cytotoxic t cells.
00:23
T cells are responsible for cell -mediated immune responses.
00:29
There's helper t cells and cytotoxic t cells.
00:33
So cytotoxic t cells are activated by helper t cells, and the role of the cytotoxic t cell is to kill infected body cells.
00:44
Okay, so let's make that pair.
00:51
Done.
00:53
All right.
00:53
Number two, a cell that secretes antibodies.
00:58
So b cells are the cells that secrete antibodies.
01:01
These cells are responsible for the humoral immune response, which defends primarily against bacteria and viruses present in bodily fluids.
01:13
As their mechanism of response, they secrete antibodies and the secretion is stimulated by helper t cells.
01:24
So we can make that pair.
01:29
Okay, a white blood cell that engulfs cells or molecules.
01:34
So now we're going to be switching gears a little bit talking about innate immunity.
01:40
Innate immunity is a set of defenses that are active immediately upon infection and are the same whether or not the pathogen has been encountered previously...