Three lines of defense of the human body (basic details about the three lines of defense of the human body)

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1. The human body has three lines of defense against pathogens.

2. The first line of defense is composed of skin, mucosa and their secretions, the second line of defense is composed of bactericidal substances (such as lysozyme) in body fluid and phagocytes, and the third line of defense is mainly composed of immune organs and immune cells.

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2024-06-19 21:01:35

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Three lines of defense of the human body (basic details about the three lines of defense of the human body)

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