One of the body’s main crucial role is to defend against the invading pathogens. There is three line of defences in the human body. The first line of defence is physical barriers like skin, mucous membrane. The second line of defence kill the microbes non-specifically by the aid of natural killer cells, macrophages, and leukocytes. The third line of defence is an immune-mediated response that kills microbes specifically and also has memory with previous microbes that have encountered.

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Chapter 21, Problem 10TF

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One of the body’s main crucial role is to defend against the invading pathogens. There is three line of defences in the human body. The first line of defence is physical barriers like skin, mucous membrane. The second line of defence kill the microbes non-specifically by the aid of natural killer cells, macrophages, and leukocytes. The third line of defence is an immune-mediated response that kills microbes specifically and also has memory with previous microbes that have encountered.

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