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The immune system protects against pathogens and other foreign threats by distinguishing self from non-self.
The immune system is a network of biological systems that protects an organism from disease. It detects and responds to a wide range of threats—including viruses, bacteria, parasites, cancer cells, and foreign objects—by distinguishing them from the body’s own healthy tissues (“self” vs “non-self”). Nearly all organisms have some form of immune defense, though complexity varies across species. Most organisms use layered protection. Physical barriers (like skin and mucous membranes) block pathogen entry; if pathogens breach these barriers, the innate immune system provides an immediate, non-specific response. If needed, the adaptive immune system mounts a tailored, antigen-specific response and builds immunological memory, enabling faster and stronger protection during later encounters with the same pathogen. Dysfunction of immune regulation can lead to disease, including immunodeficiency (recurrent severe infections), autoimmunity (immune attack on self tissues), and inflammatory or cancer-related problems.
The immune system protects against pathogens and other foreign threats by distinguishing self from non-self.
Defense occurs in layers: physical barriers, then innate non-specific responses, followed by adaptive antigen-specific responses with immunological memory.
A preconfigured, rapid defense that responds non-specifically to broad categories of pathogens or damage signals.
An antigen-specific immune response that learns from prior encounters and creates immunological memory.
A long-lasting adaptive immune capability that enables faster, stronger responses upon re-exposure to the same pathogen.
The immune system’s ability to recognize the body’s own molecules as “self” and treat foreign molecules as “non-self.”
A condition where the immune system is less active than normal, leading to recurring and potentially life-threatening infections.
A disorder in which the immune system becomes hyperactive and attacks normal body tissues as if they were foreign.
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