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18 May, 09:53

Explain why the lower respiratory tract is essentially sterile.

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  1. 18 May, 11:07
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    The lower respiratory tract is essentially sterile because epithelium lining is the respiratory tract that covers the bottom respiratory tract sterile. It basically prevented the mucus accumulation in lungs. The macrophages is the immune system part that can digest or inhaled any harmful substances.
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