TED-ED: How does the immune system work? - Emma Bryce

The video explains the immune system's crucial role in protecting the body from infections and diseases. It describes how leukocytes, or white blood cells, detect and respond to pathogens using antigens. The immune response involves phagocytes and lymphocytes, which work together to eliminate threats. Symptoms like fever and swelling aid this process. The immune system also helps develop long-term immunity, though it can malfunction in autoimmune diseases. Overall, the immune system is vital for maintaining health and preventing minor injuries or illnesses from becoming life-threatening.

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