Lab Activity: Lung Capacity
Materials: Large plastic bottle of some kind (soda pop, fruit juice, etc.), three foot long tube (rubber or plastic tubing from a hardware store or a piece of garden hose that will fit through the neck of the bottle), measuring cup or container that has milliliter calibrations, sink or bathtub, water, and your lungs. Note: if you have breathing problems, please find a volunteer who does not and use their results.
Procedure:
To begin, use a measuring cup or container to measure the exact amount of water in milliliters that fills the plastic juice or soda pop bottle to the very brim. Then screw the cap on the bottle. Run at least four inches of water into a sink or bathtub.
Next, invert the container into the sink or bathtub. With the neck under water, remove the cap and insert the tubing.
Find your tidal air volume by inhaling normally and then exhaling normally through the tubing. While exhaling, pinch your nose closed so that all of your breath goes into the tube. When you’ve finished, pull out the tubing. Then screw the cap back on while the container is submerged. Measure what’s left in the container, and subtract that amount from the starting amount in milliliters. Repeat two more times and record the average on the data table.
To find your expiratory reserve volume, use a measuring cup or container to measure the exact amount of water in milliliters that fills the plastic juice or soda pop bottle to the very brim. Then screw the cap on the bottle. Run at least four inches of water into a sink or bathtub. Next, invert the container into the sink or bathtub. With the neck under water, remove the cap and insert the tubing. Take a normal resting breath. After exhaling normally exhale forcibly into the tube. When you’ve finished, pull out the tubing. Then screw the cap back on while the container is submerged. Measure what’s left in the container, and subtract that amount from the starting amount in milliliters. Note your findings and repeat two more times. Record the average of your three tests.
Find your vital capacity by using a measuring cup or container to measure the exact amount of water in milliliters that fills the plastic juice or soda pop bottle to the very brim. Then screw the cap on the bottle. Run about four inches of water into a sink or bathtub. Next, invert the container into the sink or bathtub. With the neck under water, remove the cap and insert the tubing. Inhale as deeply as possible. Then exhale forcibly into the tube, emptying your lungs as completely as possible. When you’ve finished, pull out the tubing. Then screw the cap back on while the container is submerged. Measure what’s left in the container, and subtract that amount from the starting amount in milliliters. Note your findings and repeat the procedure two more times. Record the average of your three tests.
What to include in your word document:
1. In your own words, what did you do?
2. What is the average of your tidal air volume tests?
3. What is the average of your expiratory reserve volume tests?
4. What is the average of your vital capacity tests?
5. Do your results make sense? Explain!
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