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Biology SL Conclusion and Evaluation on Oxygen Concentration Experiment

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Introduction

Conclusion and Evaluation The experiment carried out in class was designed to test: * How Oxygen concentration changes in lungs when a person's breath is held. * How hyperventilating lungs affects Oxygen concentration in lungs. Oxygen concentration in the air is 20.9%. The oxygen measuring device measured an 18% concentration in the air, which is perfectly acceptable. A plastic bag was wrapped around the end of the oxygen measuring apparatus and the air in it was removed. The plastic bag had a hole at its bottom. The person being tested held their breath for an extended period of time (about 60 seconds) and then exhaled into the plastic bag. ...read more.

Middle

A problem that occurred frequently with other groups was that the hole at the bottom of the plastic bag was very big. This resulted in an unwanted exchange between oxygen richer and oxygen poorer airs and this made oxygen concentrations fluctuate. A simple reminder that could prevent mistakes like these from happening would be to add a reminder in the experiment guidelines such as "(REMINDER: be sure not to make the hole too large in the bag. It must be small and tight enough to fit your mouth in.)" We can see a change in this data when hyperventilation is done. ...read more.

Conclusion

The subject held his breath for 55 seconds. When hyperventilating, he held his breath for 85 seconds. Apart from this, Oxygen concentration was higher by 2 % in hyperventilated exhaled air than in non-hyperventilated exhaled air. This suggests that the concentration of oxygen in the lungs was higher to begin with when there was hyperventilation. In conclusion, we can say that hyperventilation increases the concentration of oxygen in lungs considerably but it doesn't change the rate at which oxygen is used up. The 2% increase in oxygen concentration in hyperventilated exhaled air Vs. non-hyperventilated exhaled air doesn't seem to be much, but it is significant since oxygen already isn't abundant in the air. ?? ?? ?? ?? Charles E. Spragins III Class 11 BioSL Ms. Luciana Fagundes 2010 ...read more.

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