Your Immune System: Natural Born Killer | Crash Course Biology #32
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How does the immune system work? In this video from the “Crash Course” educational YouTube series, Hank describes the team of defenses that make up our immune system. These defenses are tasked with protecting our bodies from all of the pathogens and bad guys. Students will learn that our immune system is so well-honed that, most of the time, we're able to keep all these nasty disease-instigators at bay.

Hanks discusses in-depth the two ways our immune system fights pathogens – innate immunity and acquired immunity. He also talks about the work and function of mucous membranes, dendritic cells, antibodies, leukocytes, lymphocytes and much more. It’s a full-bodied lesson! WATCH: