Final answer:
The exchange of gases occurs in the alveoli of the lungs, where oxygen is absorbed into the blood and carbon dioxide is expelled from the blood.
Step-by-step explanation:
The exchange of gases occurs in the alveoli, which are tiny sacs located at the end of the bronchial tubes within the lungs. When we inhale, air travels from the nasal cavity, through the pharynx and larynx, down the trachea, into the bronchi, through bronchioles, and finally reaches the alveoli. It is in the alveoli that gas exchange takes place, where oxygen from the air is absorbed into the blood, and carbon dioxide from the blood is expelled into the alveoli to be exhaled.