RESPIRATORY TRACT (BREATHING TRACT)

The human respiratory tract starts with the nostrils. The air passing through the nostrils is filtered by the fine hair that lines the passage. It also become moist and warm. The respiratory tract includes external nostrils, pharynx, larynx and trachea. The trachea or the wind pipe is divided into two bronchi. one enters the right lung and the other the left lung.                 Though conventionally called as respiratory tract,this tract carries out only breathing (part of respiration) so we can also call it as breathing tract.Same applies to the respiratory organ.