4 p.m. it’s okay we’re all sleep deprived rn
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. Hope this helps.
Sorry if this not helpful I am trying my best and confuse with the question
I message you a hour ago
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Maintenance of homeostasis is in a negative feed back loop because if the tempature gets too high the negative feedback loop acts to bring it back down.
