How Alveoli Increase Surface Area in Lungs

The Lung Surface Area Activity demonstrates how a small lung volume can achieve a large surface area for gas exchange, using simple materials. By measuring the volume and surface area of a jar, then filling it with small objects like marbles or ball bearings, students observe how alveoli (represented by the small objects) increase the surface area dramatically within the same volume. This activity visually and numerically illustrates the significance of alveoli in efficient respiratory function. 

Learning Objective:

To understand how branching and alveoli in the lungs increase surface area for effective gas exchange, despite the limited lung volume. 

Keywords:

Lungs, Surface area, Alveoli, Gas exchange, Respiratory system