9.1    The gas exchange system9.2    SmokingThe gas exchange system is responsible for the uptake of oxygen  into the blood and excreting carbon dioxide. An understanding of this system shows how cells, tissues and organs function  together to exchange these gases between the blood and the...

• The gas exchange system• Smoking and smoking-related diseasesLearning OutcomesCandidates should be able to:(a) [PA] describe the structure of the human gas exchange system, including the microscopic structure of the walls of the trachea, bronchioles and alveoli with their associated blood vessels;(b) [PA] describe...