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Vernier Software & Technology

Oxygen Gas and Human Respiration

Figure from experiment 19 from Agricultural Science with Vernier


The process of breathing accomplishes two important tasks for the body. During inhalation, oxygen-rich air is brought into your lungs. During exhalation, air depleted in oxygen and rich in carbon dioxide is forced out. Oxygen is then transported to the cells where it is used in the process of respiration, yielding carbon dioxide as a product.

{{\text{C}}_{\text{6}}}{{\text{H}}_{{\text{12}}}}{{\text{O}}_{\text{6}}}{\text{  +  6 }}{{\text{O}}_{\text{2}}} \to {\text{6 C}}{{\text{O}}_{\text{2}}}{\text{ }}{\text{ +  6 }}{{\text{H}}_{\text{2}}}{\text{O  +  energy}} {\text{glucose  +  oxygen }} \to {\text{carbon dioxide  +  water  +  energy}}

Gas exchange takes place in the lungs at the membrane between the alveoli and the pulmonary capillaries. It is here that oxygen diffuses into the bloodstream and carbon dioxide diffuses out. Under normal circumstances, there is an equilibrium between the oxygen and carbon dioxide levels in the blood. Several mechanisms are involved in maintaining this balance. One such mechanism involves chemoreceptors. These specialized cells respond to changes in carbon dioxide, oxygen and H+ concentrations and influence the body’s ventilation patterns to maintain the proper balance of blood gases.

In this experiment, you will determine what factors affect how long you can hold your breath. You will be tested under two different conditions. The first condition is normal breathing. The second condition is immediately following hyperventilation. Hyperventilation is when your breathing rate is greater than what is necessary for proper exchange of oxygen and carbon dioxide. This will be achieved by a period of rapid breathing prior to holding your breath.


In this experiment, you will

  • Use an O2 Gas Sensor to determine residual oxygen levels in exhaled air.
  • Evaluate how internal O2 and CO2 concentrations influence breathing patterns.

Sensors and Equipment

This experiment features the following Vernier sensors and equipment.

Option 1

Option 2

Additional Requirements

You may also need an interface and software for data collection. What do I need for data collection?

Standards Correlations

See all standards correlations for Agricultural Science with Vernier »

Agricultural Science with Vernier

See other experiments from the lab book.

1Introduction to Data Collection
2Acids and Bases
3Diffusion through Membranes
4Conducting Solutions
6Respiration of Sugars by Yeast
7Reflection and Absorption of Light
8Soil pH
9Soil Salinity
10Soil Temperature
11Soil Moisture
12APhotosynthesis and Respiration (CO2)
12BPhotosynthesis and Respiration (O2)
12CPhotosynthesis and Respiration (CO2 and O2)
14ACell Respiration (CO2)
14BCell Respiration (O2)
14CCell Respiration (CO2 and O2)
15The Greenhouse Effect
16Energy in Food
17AEnzyme Action: Testing Catalase Activity
17BEnzyme Action: Testing Catalase Activity
18ALactase Action
18BLactase Action
19Oxygen Gas and Human Respiration
20Biochemical Oxygen Demand
21Animal Temperature
22Lemon "Juice"
23Ohm's Law
24Energy Content of Fuels
25Photovoltaic Cells
26Wind Power
27Watershed Testing
28Interdependence of Plants and Animals
29Biodiversity and Ecosystems

Experiment 19 from Agricultural Science with Vernier Lab Book

<em>Agricultural Science with Vernier</em> book cover

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