00:01
Chemical barriers, inflammation, or interference.
00:05
So there are three lines of defence.
00:07
I'm going to write what they are.
00:09
So the first line, this is the barriers.
00:14
Barriers.
00:15
So they don't do anything.
00:17
They're just there all the time.
00:18
They are your tears, they are your saliva, your stomach acid, your skin.
00:25
Then there's the second line of defense.
00:27
This is the innate response.
00:30
This is the inflammation.
00:32
This is the phagocytosis...