Question

what the physical barries in the human body that protect against the entry of pathogens?
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Answer 1

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

the physical barriers in human body as follows

leukocytes granulocytes monocytes lymphocytes .