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The Respiratory System:
Lungs
Paul Guerra | Scott Horner
Today’s ObjectiveScience TEKS: 7.12B. TSIET: identify the main
functions of the systems of the human organism, including the respiratory system.
Math TEKS: 7.9B. TSIET: Measurement. The student solves application problems involving estimation and measurement. (B) Connect models for volume of prisms and cylinders to formulas of prisms and cylinders.
Why are lungs important?
The lungs are the site of gas exchange, meaning that oxygen will enter your blood and carbon dioxide will leave your blood in the lungs.
Oxygen is needed to generate energy in cells and carbon dioxide is a waste product that can acidify the blood if not expelled.
The Human Lungs
#2#1 #3
#4 #5
#6 #7
Interesting Lung FactsYour left lung is smaller than your right lung in
order to have room for your heart.
The only organ that can float on water.
The pair of human lungs can hold about 6,000 cubic centimeters (6 liters) of air, but only a small amount of this capacity is used during normal respiration (breathing).
Lung Capacity (Volume)
7 cm
4 cm
4 cm
How much air fits in this shape?
Step 1: Find out the area of the base.
Step 2: Multiply by the height.
How much air fits in this shape?
Step 1: Find out the area of the base.
Step 2: Multiply by the height.
A = L x W A = L x W 4 cm
4 cm
16 cm²
16 cm² x = 16 cm² x = 112 cm³
7 cm
Lung Capacity (Volume)
How much air fits in this shape?
Step 1: Find out the area of the base.
Step 2: Multiply by the height.
How much air fits in this shape?
Step 1: Find out the area of the base.
Step 2: Multiply by the height.
A = π r ² A = π r ² 2 cm
12.56
cm²
12.56 cm² x =
12.56 cm² x =
87.92
cm³
7 cm
7 cm
4 cm
Lung Capacity ActivityIn this activity, you will use a balloon and a tape
measure to determine your lung capacity (volume).
Break up into groups of 2.
- 1 Balloon Blower.
- 1 Balloon Measurer.
Balloon blowers will take a deep breath, and blow as much air as they possibly can into the balloon.
Measurers will measure and record circumference (3 Trials) in order to determine the volume.
Volume of Balloon (Sphere)
Using your average circumference, use the following formula to determine your radius.
C = 2πr r = C/2π
Using your radius, determine the volume of your balloon by using the following formula:
V = (4/3)πr³
Example: Circumference of 67cm Radius of 10.87cm
V = (4/3)π(10.87)³ = 5379.94 cm³
Record your data and be prepared to share your results with the class.
Factors Affecting Lung Capacity
Larger Volumes Smaller Volumes
Males Females
Taller People Shorter People
Non-Smokers Heavy Smokers
Athletes Non-Athletes
People living at high altitudes People living at low altitudes
