We will emphasize mammalian respiratory anatomy and physiology in a brief introduction to gas exchange mechanisms. I. Mammalian Respiratory System A. Anatomy Examine this illustration and the one given out in class.
Air enters the mammalian respiratory system through the two external nares .
It is then in the nasal cavity , inside the nose. In this area air is warmed and moistened. The inhaled gases now enter the voicebox, or larynx which contains the vocal cords. The trachea divides into 2 branches, one going to each lung, the primary bronchi . The primary bronchi divide, sending a branch to each lobe of each lung.