Question

16.Explain about first line of defence ?
please give right answer ​

Answer 1

Explanation:

The first line of defence (or outside defence 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.

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Answer 2

Answer:

look below

Explanation:

The first line of defence includes physical and chemical barriers that are always ready and prepared to defend the body from infection.

yeah that's a short answer but this is it

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