In the penultimate episode of Crash Course Anatomy & Physiology, Hank explains your adaptive immune system. The adaptive immune system's humoral response guards extracellular terrain against pathogens. Hank also explains B cells, antibodies, and how vaccines work.

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Table of Contents
Adaptive Immune System's Humoral Response 1:19
How B Cells Mature, Identify Antigens, and Make Antibodies 2:42
How Antibodies Warm Pathogens and Mark Them for Death 5:22
Active and Passive Humoral Immunity 6:03
How Vaccines Work 6:27

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