This past week, the final-year DP students focused their studies on gas exchange processes in the human body. They learned about the structure and functions of the respiratory system, including the lungs, trachea, bronchi and alveoli. Models and diagrams were used to illustrate how oxygen is absorbed from inhaled air into the bloodstream, and carbon dioxide is simultaneously removed from venous blood and exhaled.
A particular focus was placed on the mechanics of gas diffusion that facilitates this exchange of oxygen and carbon dioxide at the alveolar-capillary membrane. Some students had the opportunity to measure their own lung volumes and capacities using spirometry equipment.
In addition to examining human respiration, the class discussed how the leaf of a plant is adapted for gas exchange.
Students demonstrated their understanding through the use of models to explain the process of gas exchange in plants. This will serve as a solid foundation for further exploration in their HL course.
