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The immune system protects against disease by recognizing threats (pathogens, foreign objects, and abnormal cells) and distinguishing them from self tissues.
The immune system is a network of biological systems that protects an organism from disease by detecting and responding to pathogens (such as viruses, bacteria, and parasites), cancer cells, and foreign objects, while distinguishing them from the body’s own healthy tissue. Nearly all organisms have some form of immune defense, and many species use two major subsystems: innate immunity, which provides a rapid, preconfigured response to broad threats, and adaptive immunity, which tailors responses to specific antigens through learning and generates immunological memory. Protection occurs through layered defenses. Physical barriers (like skin and mucous membranes) help prevent entry of microbes, and if pathogens breach these barriers, the innate immune system responds immediately in a non-specific way. If needed, the adaptive immune system is activated and mounts antigen-specific attacks; after the threat is cleared, memory cells enable faster and stronger responses upon re-exposure. When immune regulation fails, protective roles can be disrupted, leading to immune-related diseases such as immunodeficiency (increased infections), autoimmunity (attack on self tissues), and inflammatory or cancer-related problems.
The immune system protects against disease by recognizing threats (pathogens, foreign objects, and abnormal cells) and distinguishing them from self tissues.
Defense is layered: physical barriers block entry, innate immunity provides immediate non-specific responses, and adaptive immunity provides specific responses with immunological memory.
Immune dysfunction can cause disease, including immunodeficiency, autoimmunity, and inflammatory conditions, highlighting the importance of proper immune regulation.
A preconfigured, rapid defense that responds non-specifically to broad classes of pathogens and damage signals.
A targeted immune response that learns to recognize specific antigens and creates immunological memory for faster future protection.
The long-lasting ability of adaptive immunity to respond more quickly and strongly upon re-encounter with the same pathogen.
Receptors of innate immune cells that detect conserved molecular patterns associated with pathogens (PAMPs) or host damage (DAMPs).
Substances that bind to specific immune receptors and trigger an immune response, often derived from pathogens or abnormal cells.
A major humoral component of innate immunity that amplifies killing and helps tag pathogens for destruction.
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 self tissues as if they were foreign.
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