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Factors In Air-Breathing Vertebrates

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In air-breathing vertebrates, the tidal volume of the lungs is the amount of air normally inhaled, while the lung capacity is the maximum amount of air inhaled. In this experiment, a round balloon is utilized to measure both the tidal volume and the lung capacity. Furthermore, students explored possible factors impacting the vital capacity. Students established that body position is one factor that has an impact on vital capacity. In this case, a standing position versus a seated position, provides more room for the expansion of the chest cavity, thus allowing more air to be inhaled, resulting in increased lung capacity.
Keywords: vertebrates, tidal volume, lungs, lung capacity, factors, impact, position, expansion
Introduction
In air-breathing vertebrates, the lungs are “two large organs of respiration located in the chest cavity and responsible for adding oxygen to and removing carbon dioxide from the blood” (Encyclopædia Britannica, 1) The lungs expand and contract with each breath, and the amount of air moving in and out of the lungs can vary. A diagram of the lungs is represented in the appendix Diagram, labeled as Figure 1. To establish the amount of air inhaled, lung capacity needs to be established. Lung capacity can be measured either using a spirometer (Encyclopædia Britannica, 1) or simply by using a round balloon. The amount of air inhaled in a single breath is called the tidal volume. “In the average adult, tidal volume is about 0.5 liters. However, the lungs
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