Which of the following does not belong to the 2 line of defense?
The gastricjuices
To answer this question, we need to understand what is meant by the 2 lines of defense. The 2 lines of defense refer to the different levels of defense mechanisms our body has against invading pathogens and other harmful microorganisms.
The first line of defense is made up of physical and chemical barriers that prevent or limit the entry of pathogens into the body. Examples of the first line of defense include the skin, mucous membranes, and the acidity of our stomach.
The second line of defense is a non-specific immune response that involves the activation of immune cells such as phagocytes, natural killer cells, and cytokines. This line of defense targets and eliminates pathogens that enter the body despite the physical barriers of the first line of defense.
Therefore, the following options belong to the second line of defense: phagocytes, natural killer cells, and cytokines. The option that does not belong to the second line of defense is the skin, which is a part of the first line of defense.
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