The complement system involves a series of proteins found in the blood that are part of the immune response. But what exactly are they, and how do they function.

There are two pathways involved: The classical pathway and the alternative pathway. Once you know the classical pathway, you also know the alternative pathway because it's part of the classical pathway.

00:00 Intro
00:33 Complement System Proteins
01:02 The Two Pathways
01:32 The Classical Pathway
04:07 The Alternative Pathway
04:39 Pathways Review
05:29 Outro