Antioxidants against Free Radicals [mechanisms]

In this video, we're going to see what free radicals are, and also how antioxidants protect us against them. It's gonna be an interesting one.
A free radical is a highly reactive and unstable chemical species that contains one or more unpaired electrons in its outermost electron shell. These unpaired electrons make free radicals highly reactive because they seek to pair up with other electrons in nearby molecules. As a result, free radicals can participate in various chemical reactions, both beneficial and harmful, in the body and the environment.

The main mechanisms of how antioxidants protect us against free radicals discussed in this video are: Hydrogen atom donation, Electron donation, Metal ion chelation, Antioxidant enzyme regulation, and the Activation of sirtuins.

The content of the video:
Intro (0:00)
What are free radicals? : (0:08)
Mechanism #1 of Antioxidant Activity (2:45)
Mechanism #2 of Antioxidant Activity (4:00)
Mechanism #3 of Antioxidant Activity (4:54)
Mechanism #4 of Antioxidant Activity (6:56)
Mechanism #5 of Antioxidant Activity (12:47)