1
What You Will Do
Explain the importance of aerobic activity
to your health and fitness.
Recognize the role of the circulatory and
respiratory systems in aerobic conditioning.
Identify the physical benefits of aerobic activity.
Evaluate your cardiorespiratory endurance level.
2
Terms to Know
aerobic activity
circulatory system
hemoglobin
stroke volume
arteries
capillaries
veins
respiratory system
diaphragm
cardiorespiratory
endurance
3
Your Heart, Lungs, and Circulation
Participating in aerobic activities regularly will
increase your cardiorespiratory endurance.
4
Your Heart, Lungs,
and Circulation
The word aerobic means “with
oxygen.”
Done regularly, aerobic activity
strengthens the heart and the
lungs.
Term to Know
Aerobic activities
Continuous
activity that
requires large
amounts of
oxygen.
5
Your Circulatory System
To understand how aerobic
activities work, you need to have
some knowledge of the
circulatory system, also called
the cardiovascular system.
Term to Know
Circulatory
system
Consists of the
heart, blood, and
blood vessels.
This system is responsible for
circulating blood throughout the
body.
6
Your Circulatory System
The heart is the main organ of the circulatory
system.
The right side of the heart pumps blood to the
lungs, where it picks up oxygen and rids itself
of carbon dioxide.
The left side of the heart pumps oxygen-rich
blood to the rest of the body.
7
Your Circulatory System
Term to Know
Hemoglobin
The blood carries oxygen via
hemoglobin.
An iron-rich
compound in the
blood that helps
carry the oxygen.
8
Your Circulatory System
Term to Know
Stroke volume
When at rest, the heart beats an
average of 72 times per minute.
The amount of
blood pumped per
beat of the heart.
Your heart rate and stroke
volume increase during
strenuous physical activity.
9
Your Circulatory System
Blood is carried to and from the heart via a
network of blood vessels.
There are three types of blood vessels:
arteries, capillaries, and veins.
10
Your Circulatory System
Term to Know
Arteries
Arteries are blood vessels that
carry blood to the body tissues.
Vessels that carry
the blood from the
heart to the major
extremities, such
as the arms, legs,
and head.
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Your Circulatory System
Term to Know
Capillaries
Capillaries are blood vessels that
carry blood throughout the body.
Smaller blood
vessels that deliver
oxygen and other
nutrients to
individual cells.
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Your Circulatory System
Term to Know
Veins
Veins are blood vessels that
deliver blood from the capillaries
back to the heart via the lungs.
Blood vessels that
deliver blood back
to the heart.
13
Your Circulatory System
The oxygen that your blood
carries is introduced into your
body by means of your
respiratory system.
Term to Know
Respiratory
system
The body system
that exchanges
gases between
your body and the
environment.
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Your Circulatory System
The principal organ of your respiratory system
is your lungs.
Your lungs exchange oxygen and carbon
dioxide through the process of respiration.
15
Your Circulatory System
Term to Know
Diaphragm
Unlike the heart, the lungs are not
a muscle.
A muscle found
between the chest
cavity and
abdomen.
Rather, they get their power from
the diaphragm, the intercostal
muscles around the ribs, and the
abdominal muscles in the lower
stomach area.
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Your Circulatory System
Benefits of Aerobic Activity
Strengthens the body
Increases stroke volume
Lowers your resting heart rate
Conditions the muscles used in breathing
Results in more effective delivery of oxygen
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Your Circulatory System
One long-term result of regular
physical activity is
cardiorespiratory endurance.
Term to Know
Cardiorespiratory
endurance
The ability of the
body to work
continuously for
extended periods
of time.
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Your Circulatory System
Cardiorespiratory endurance increases your
chances for living a longer and healthier life.
By engaging in regular aerobic activity now, you
can reduce your risk of developing lifestyle
diseases later.
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Lesson 1 Review
Reviewing Facts and Vocabulary
1. Vocabulary Define aerobic
activity.
2. Recall What two body
systems are most
immediately involved in
aerobic conditioning?
1. Vocabulary
2. Recall
Circulatory and
Continuous
activity
respiratory
that
requires large amounts of
systems.
oxygen.
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