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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Chapters:
Introduction: Adaptive Immune Responses 00:00
How B Cells Identify Antigens 2:14
B Cells Become Effector Cells & Memory Cells 4:05
How Antibodies Fight Antigens 5:22
Active and Passive Humoral Immunity 6:03
How Vaccines Work 6:27
Review 8:30

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