2. 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.

3. Terms to Know aerobic activity circulatory system hemoglobin
stroke volume
arteries
capillaries
veins
respiratory system
diaphragm
cardiorespiratory endurance

4. Your Heart, Lungs, and Circulation
Participating in aerobic activities regularly will increase your cardiorespiratory endurance.

5. Your Heart, Lungs, and Circulation
Aerobic activities
Continuous activity that requires large amounts of oxygen.
Term to Know
The word aerobic means “with oxygen.”
Done regularly, aerobic activity strengthens the heart and the lungs.

6. Your Circulatory System
Consists of the heart, blood, and blood vessels.
Term to Know
To understand how aerobic activities work, you need to have some knowledge of the circulatory system, also called the cardiovascular system.
This system is responsible for circulating blood throughout the body.

7. 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.

8. Your Circulatory System
Hemoglobin
An iron-rich compound in the blood that helps carry the oxygen.
Term to Know
The blood carries oxygen via hemoglobin.

9. Your Circulatory System
Stroke volume
The amount of blood pumped per beat of the heart.
Term to Know
When at rest, the heart beats an average of 72 times per minute.
Your heart rate and stroke volume increase during strenuous physical activity.

10. 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.

11. Your Circulatory System
Arteries
Vessels that carry the blood from the heart to the major extremities, such as the arms, legs, and head.
Term to Know
Arteries are blood vessels that carry blood to the body tissues.

12. Your Circulatory System
Capillaries
Smaller blood vessels that deliver oxygen and other nutrients to individual cells.
Term to Know
Capillaries are blood vessels that carry blood throughout the body.

13. Your Circulatory System
Veins
Blood vessels that deliver blood back to the heart.
Term to Know
Veins are blood vessels that deliver blood from the capillaries back to the heart via the lungs.

14. Your Circulatory System
Respiratory system
The body system that exchanges gases between your body and the environment.
Term to Know
The oxygen that your blood carries is introduced into your body by means of your respiratory system.

15. 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.

16. Your Circulatory System
Diaphragm
A muscle found between the chest cavity and abdomen.
Term to Know
Unlike the heart, the lungs are not a muscle.
Rather, they get their power from the diaphragm, the intercostal muscles around the ribs, and the abdominal muscles in the lower stomach area.

17. 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

18. Your Circulatory System
Cardiorespiratory endurance
The ability of the body to work continuously for extended periods of time.
Term to Know
One long-term result of regular physical activity is cardiorespiratory endurance.

19. 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.

20. Vocabulary Define aerobic activity.
Lesson 1 Review
Reviewing Facts and Vocabulary
2. Recall
Circulatory and respiratory systems.
1. Vocabulary
Continuous activity that requires large amounts of oxygen.
Vocabulary Define aerobic activity.
Recall What two body systems are most immediately involved in aerobic conditioning?

21. End of
Table of Contents