Human respiratory mucus has non-Newtonian rheological properties of viscoelasticity, shear-thinning and yield stress. They play significant roles in mucus clearance by ciliary motion as well as cough [5,7,9]. Mucus is hypersecreted in such lung diseases as cystic fibrosis and asthma. Mucus hypersecretion damages mucus clearance mechanism [6], and more likely causes plugs to block partial or total airways [4].

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