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

6 Your Circulatory System To understand how aerobic activities work, you need to have some knowledge of the circulatory system, also called the cardiovascular system. Circulatory system Consists of the heart, blood, and blood vessels. Term to Know 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 The blood carries oxygen via hemoglobin. Hemoglobin An iron-rich compound in the blood that helps carry the oxygen. Term to Know

9 Your Circulatory System When at rest, the heart beats an average of 72 times per minute. Stroke volume The amount of blood pumped per beat of the heart. Term to Know 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 are blood vessels that carry blood to the body tissues. Arteries Vessels that carry the blood from the heart to the major extremities, such as the arms, legs, and head. Term to Know

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

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

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

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 Unlike the heart, the lungs are not a muscle. Diaphragm A muscle found between the chest cavity and abdomen. Term to Know 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 One long-term result of regular physical activity is cardiorespiratory endurance. Cardiorespiratory endurance The ability of the body to work continuously for extended periods of time. Term to Know

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

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