The human body has three line of defenses to protect the body from the attack of the pathogens. The first line of defense includes the physical barriers that prevent the entry of these antigens into the body. The second line of defense includes the leukocytes, inflammatory response and fever, and the third line of defense includes the antibodies secreted by the lymphocytes and the memory cells.
The innate immunity includes the proteins and cells which are already present in the body of a person. The adaptive immunity fights the pathogens that escape the innate immunity. The components of adaptive immunity includes B and T lymphocytes. The acquired immunity refers to the memory of the previously fought antigen.
The fever and flu of the Nina exhibits the second line of defense which is a part of the innate immunity.
Immune system of the body functions to protect and eliminate any pathogenic agents. The immune system have first line defense, second line defense, third line defense. The defense mechanism can be based on adaptive, acquires, or innate immunity.
The defense mechanism of the body includes:
The immunity can be categorised into innate, adaptive, and acquired. Innate immunity is provided when the proteins or cells are already present in the body, whereas adaptive immunity is the occurs after an exposure to pathogen or antigen.
The sentence in the given question can be completed as:
Nina has the flu and a high fever. Her immune system is exhibiting second line of defense that is a part of innate immunity.
Therefore, the immune system functions differently based on the type of pathogen and immunity.
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