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Sagot :
Our body’s last and most complicated line of defense against infection is the immune system.
The immune system, a network of biological mechanisms, protects an organism from disease. It can distinguish between a wide variety of pathogens, such as viruses, parasitic worms, cancer cells, and objects like wood splinters, and respond to them. Numerous species have two primary immune system subsystems. The innate immune system has a preset manner of reacting to different situations and stimuli. The adaptive immune system gains the ability to identify molecules it has already encountered and reacts uniquely to each stimulus. To do their different jobs, both depend on molecules and cells.
A form of immune system is present in almost all living things. Enzymes that guard against virus infections make up the basic immune system that bacteria have. Other fundamental immune systems developed in prehistoric plants and animals and are still present in their modern offspring. The complement system, defensin antimicrobial peptides, and phagocytosis are some of these processes. Jawed vertebrates, such as humans, have far more complex defense mechanisms, including the capacity to adapt to more effectively identify diseases. Adaptive (or acquired) immunity develops an immunological memory that improves the body's response to the same pathogen in the future. The cornerstone for vaccination is this process of developing immunity.
Learn more about ‘immune system’ here:
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