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Natalija [7]
3 years ago
13

What is the first line of defense

Health
1 answer:
mixer [17]3 years ago
7 0
The first line of defence<span> (or outside </span>defence<span> system) includes physical and chemical barriers that are always ready and prepared to defend the body from infection. These include your skin, tears, mucus, cilia, stomach acid, urine flow, 'friendly' bacteria and white blood cells called neutrophils.</span>
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