Respiratory tract secretions are thin and watery to protect the upper respiratory tract from toxins.

Name: Respiratory tract secretions are thin and watery to protect the upper respiratory tract from toxins.
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Respiratory tract secretions are actually thick and sticky to trap and remove particles like dust, bacteria and viruses from the airways. The thickness of the mucus also helps to slow down the entry of harmful substances into the lungs.

Respiratory Tract Secretions Are Thin and Watery to Protect the Upper