Write the external features of lungs for 5 marks
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The lung is the essential organ of the respiratory system. In mammals and more complex life forms, the two lungs are located near the backbone on either side of the heart.
Their principal function is to transport oxygen from the atmosphere into the bloodstream, and to release carbon dioxide from the bloodstream into the atmosphere. Air travels through the mouth or nose into the pharynx, larynx, trachea, and bronchi and bronchioles in order to reach the lungs.
The exchange of gases is performed by the alveoli, the functional units of the lungs.
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