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Chapter 37.3
The Respiratory
System
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Respiratory system
Primary Function: obtaining O2 and removing CO2.
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Respiration = bringing O2 into our bodies, blood carries that O2
to our tissues, O2 diffuses into our tissues, CO2diffuses from
tissues to blood, blood returns to heart to become oxygenated
again.
Respiratory system contd
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Nose
Mouth
Pharynx
Larynx
Trachea
Epiglottis
Bronchi
Capillaries
Lungs
Respiratory system
structures
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Pharynx space, not a structure, , passageway for food and
air
Larynx a.k.a. voice box
Trachea windpipe, , cartilage
Respiratory system
structures contd
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Epiglottis flaplikestructure that stands upright, allows air to
enter larynx, during swallowing it presses downward and prevents
food from entering air passages
Respiratory system
structures contd
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Activity! Try and swallow and breathe at the same time? Could
you do it?
No, because your epiglottis closed during the
swallowing reflex.
Respiratory system
structures contd
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Bronchi passageways to lungs
Bronchus Bronchioles Alveoli
Respiratory system
structures contd
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Lungs 2 lobes that house the bronchioles and alveoli; sealed in
a pleural membrane
Elastic
Respiratory system
structures contd
Lung cake, mmmm!
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Cilia and Mucus dust trappers, move dust toward pharynx to be
swallowed or spit out
Respiratory system
structures contd
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Occurs between alveoli and surrounding capillaries
O2 and CO2exchange occurs by diffusion
Gas Exchange
Capillaries
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Gas Exchange contd
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Breathing
Lungs are sealed tightly in pleural membranes in the chest
cavity
At the bottom of the cavity is a large, flat muscle called the
diaphragm
Controlled by medulla oblongata
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During inhalation, the
diaphragm contracts and
the rib cage rises up.
This expands the volume
of the chest cavity.
The chest cavity is sealed,
so this creates a partial
vacuum inside the cavity.
Atmospheric pressure fills
the lungs as air rushes into
the breathing passages.
Breathing contd
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Often exhaling is a
passive event.
When the rib cage
lowers and the
diaphragm relaxes,
pressure in the chest
cavity is greater than
atmospheric pressure.
Air is pushed out of the
lungs.
Breathing contd
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Breathing contd
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Activity! Build a Lung/Lung Capacity
Breathing contd
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Activity! Heart rate, breathing rate and exercise
Circulatory and Respiratory
systems work together!
We will be moderately exercising. Please let me know if you have
a medical condition that I should
be aware of.
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Asthma
Bronchitis
COPD- chronic obstructive pulmonary disease
Emphysema
Influenza
Laryngitis
Lung cancer
Tuberculosis
Respiratory Health
