Transcript Your Circulatory System

1
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.
2
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.
3
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.
4
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.
5
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.
6
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.
7
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.
8
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.
9
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.
10
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.
11
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.
12
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.
13
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
14
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.
15
Aerobic vs. Anaerobic Physical Activities
There are two sides to total fitness:
cardiorespiratory fitness
anaerobic fitness
16
Aerobic vs. Anaerobic
Physical Activities
Aerobic activity must occur over a
sustained period of time;
anaerobic activity works
differently.
Term to Know
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.
17
Aerobic vs. Anaerobic Physical Activities
Anaerobic means “without oxygen.”
The energy produced in anaerobic activities
does not depend on oxygen.
18
Aerobic vs. Anaerobic
Physical Activities
Term to Know
Participation in anaerobic
activities leads to anaerobic
fitness.
Higher levels of
muscular strength,
muscular
endurance, and
flexibility.
anaerobic fitness
19
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.
20
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.
21
Aerobic vs. Anaerobic
Physical Activities
Term to Know
Interval training can allow
you to work aerobically and
anaerobically in the same
workout.
A program in which
high-intensity
physical activities
alternate with lowintensity recovery
bouts for several
minutes at a time.
Interval training
22