1. 2 Your Heart, Lungs, and Circulation The word aerobic means “with oxygen.” Aerobic activities...
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Transcript of 1. 2 Your Heart, Lungs, and Circulation The word aerobic means “with oxygen.” Aerobic activities...
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Your Heart, Lungs, and CirculationThe 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.
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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.
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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.
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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
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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.
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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.
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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.
Cardiorespiratory endurance
The ability of the body to work
continuously for extended periods
of time.
Term to Know
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Aerobic vs. Anaerobic Physical ActivitiesAerobic activity must occur over a sustained period of time; anaerobic activity works differently.
Anaerobic activity
Activity that requires high
levels of energy and is done for
only a few seconds or minutes at a
high level of intensity.
Term to Know
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Aerobic vs. Anaerobic Physical Activities
Anaerobic means “without oxygen.”
The energy produced in anaerobic activities does not depend on oxygen.
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Aerobic vs. Anaerobic Physical ActivitiesParticipation in anaerobic activities leads to anaerobic fitness.
anaerobic fitness
Higher levels of muscular strength,
muscular endurance, and
flexibility.
Term to Know
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Aerobic vs. Anaerobic Physical Activities
Anaerobic activities require large amounts of energy, a requirement that your body cannot meet for very long.
This is because your heart cannot supply enough oxygen-rich blood to your tissues and organs to meet the high demand.
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Aerobic vs. Anaerobic Physical Activities
When you can meet your energy needs by supplying large amounts of oxygen to your body, you are working primarily in an aerobic mode.
If you cannot meet the oxygen demands of a high-intensity physical activity, your body is more conditioned to working anaerobically.
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Aerobic vs. Anaerobic Physical ActivitiesInterval training can allow you to work aerobically and anaerobically in the same workout.
Interval training
A program in which high-intensity
physical activities alternate with low-intensity recovery bouts for several minutes at a time.
Term to Know
