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The Respiratory System:
Lungs
Paul Guerra | Scott Horner
Today’s Objective
 Science 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.
ANTI-SMOKING AD
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
#1
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#2
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#5
#7
Interesting Lung Facts
 Your 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)
How much air fits in this
shape?
4
cm
4
cm
Step 1: Find out the area of the base.
16
cm²
4
cm
4
cm
A = L x W
7
cm
Step 2: Multiply by the height.
16 cm² x
7
cm
=
112
cm³
Lung Capacity (Volume)
How much air fits in this
shape?
Step 1: Find out the area of the base.
4
cm
A = π cm
r2 ²
12.56
cm²
7
cm
Step 2: Multiply by the height.
12.56 cm² x
7
=
cm
87.92
cm³
Lung Capacity Activity
In 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
Trials) in order to determine the volume.
(3
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