The Immune System: How Does Your Body Know What Belongs?
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The Immune System: How Does Your Body Know What Belongs?
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Every second, your immune system is making decisions.
Ignore this. Attack that. Repair this tissue. Remember that pathogen. Do not attack yourself.
Most of the time, those decisions happen without you noticing.
In Episode 7 of Inside Your Biology, we investigate how the immune system recognizes threats, coordinates inflammation, builds memory, and avoids attacking the body it is supposed to protect.
We explore innate and adaptive immunity, antibodies, T cells, B cells, macrophages, neutrophils, cytokines, lymph nodes, vaccines, immune memory, allergies, autoimmunity, and why a stronger immune response is not always a better one.
We also examine popular claims about “boosting” immunity, supplements, fever, getting sick after stress, cold weather, and whether repeated infections make the immune system stronger.
The deeper question is:
How does a system powerful enough to destroy infected cells learn when to attack and when to leave something alone?
Inside Your Biology — The science of what’s happening inside you.