As you pull down the balloon at the bottom of the model, the two small balloons inside the model will inflate. This represents the process of inhaling, where the diaphragm contracts and the lungs expand to take in more air. The inflation of the small balloons demonstrates how the volume of the lungs increases during inhalation.
When you push up the balloon at the bottom of the model, the two small balloons will deflate. This represents the process of exhaling, where the diaphragm relaxes and the lungs contract, expelling air. The deflation of the small balloons demonstrates how the volume of the lungs decreases during exhalation.
