1. Cardiovascular System
Lung Capacity Lab:
Cardiovascular System
Materials:
Balloons
String
Rulers/meter sticks
Calculators

2. Procedure:
Blow up your balloon carefully to stretch the balloon. Release the air.
Inhale as much air as possible and exhale it into your balloon. Pinch off your balloon to hold the air. If necessary, push your balloon into a sphere.
Have your partner wrap the string around the largest part of the balloon.
Measure this distance using the ruler or meter stick.
Repeat for 5 trials.

3. Data Table: Trial 1 Trial 2 Trial 3 Trial 4 Trial 5
(measure in cm)
Average Circumference:
Circumference = 2r x 3.14
Using the above formula solve for your average radius:____________
Volume of a sphere = 4/3 x 3.14 x r 3
Using the above formula find the volume of your “lungs”:_____________(ml)
This number is known as your MLC= Measured Lung Capacity ↑

4. Theoretical Lung Capacity:
My height in centimeters:______
My age in years:_______
Formula:
V = 0.041(height) – 0.018(age) -2.69
TLC= ________ x 1000 = ________mL

5. Analysis:
How does your measured lung capacity compare with your theoretical lung capacity? (MLC/TLC x 100)= %
Select a variable from the class data (age, gender, height, weight, etc.)
Create a graph to show how the variable is related to MLC.
Write a conclusion paragraph based on the your groups data.
Participate in the class discussion.

6. Checklist of things to turn in:
Individual Data Sheet:
Individual Data Table (Slide 3)
Calculations showing TLC and MLC (Slide 3 &4)
Analysis Question #1 answered in complete sentence.
Variable Analysis:
Graph displaying variable and affect on MLC
Conclusion Paragraph (#5, slide 5)
Restate your purpose or objective. What two variables were you looking for a relationship between?
Analyze your data (what does your data say? why is your data the way it is? are there any trends?)
State two sources of error that occurred (or could have occurred) in your lab
What is your overall conclusion/summary of data? What relationship is between the variables, if any?
What did you learn from this lab?