Here are the essential concepts you must grasp in order to answer the question correctly.
First Line of Defense
The first line of defense in the immune system refers to the body's initial protective barriers against pathogens. This includes physical barriers like skin and mucous membranes, which prevent the entry of harmful microorganisms. These barriers are crucial for maintaining health and preventing infections.
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Innate Immunity
Innate immunity is the body's immediate and non-specific response to pathogens. It includes various cells and proteins, such as phagocytes and natural killer cells, that act quickly to eliminate invaders. This type of immunity does not require prior exposure to a pathogen, making it a vital component of the first line of defense.
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Adaptive Immunity
Adaptive immunity is a specific immune response that develops over time and is tailored to particular pathogens. It involves the activation of lymphocytes, such as T cells and B cells, which provide long-lasting protection through memory cells. While adaptive immunity is crucial for a robust defense, it is not part of the first line of defense, which relies on innate mechanisms.
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