What is Health and medicine?
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Direct answer
- The immune system is a network of biological systems that protects an organism from diseases. 1
- It detects and responds to a wide variety of pathogens, such as viruses, bacteria, and parasites, as well as cancer cells and foreign objects, such as wood splinters—distinguishing them from the organism's own healthy tissue. 1
- Many species have two major subsystems of the immune system. 1
- The innate immune system provides a preconfigured response to broad groups of situations and stimuli. 1
Medical knowledge changes as evidence accumulates. These pages describe conditions and treatments as the sources do — they are not medical advice.
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Immune system
Biological system protecting an organism against disease
The immune system is a network of biological systems that protects an organism from diseases. It detects and responds to a wide variety of pathogens, such as viruses, bacteria, and parasites, as well as cancer cells and foreign objects, such as wood splinters—…
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Vaccine
Preparation for acquired immunity to disease
A vaccine is a biological preparation that provides active acquired immunity to a particular infectious or malignant disease. The safety and effectiveness of vaccines has been widely studied and verified. A vaccine typically contains an agent that resembles a …
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Diabetes
Group of endocrine diseases characterized by high blood sugar levels
Diabetes mellitus, commonly known as diabetes, is a group of common endocrine diseases characterized by sustained high blood sugar levels. Diabetes tends to progress in severity, and is due to either a reduced production of the hormone insulin by the pancreas …
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Human brain
Central organ of the human nervous system
The human brain is the central organ of the nervous system, and with the spinal cord, comprises the central nervous system. It consists of the cerebrum, the brainstem and the cerebellum. The brain controls most of the activities of the body, processing, integr…
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Related topics
- Science — Biology, chemistry and physics — how the natural world actually works.
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Curated by movaindus · last reviewed 19 October 2026. Chosen by hand, not generated. Every entry names the article that answers it.