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I would have to say the Immune System is the third line of defense in the human body- Acquired Immunity B and T cells Lymphocytes.

1. First line of defense- Physical barriers like the skin and mucus membranes

2. Second line of defense- Phagocyte cells: These are cells that gooble up waste products

Source:

Taught Anatomy and Physiology to nursing students for over 2 years- My head

RN in NJ

Hope this helps.

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14y ago

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Q: What is your 3rd line of defense?
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