Sentence:  The natural anatomical and physiological defensive features of the upper respiratory tract , such as the turbinates of the <WSD>nose</WSD> and the cilia of the trachea and larger bronchi , are capable of impinging out the larger particles to which we are ordinarily exposed in our daily existence . 
Meaning of the word marked with <WSD> tags:  the organ of smell and entrance to the respiratory tract; the prominent part of the face of man or other mammals