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The Respiratory System
Purpose of the respiratory
system
• To provide a constant supply of oxygen
to keep your body cells functioning
• To remove carbon dioxide from the
body cells
Organs of the respiratory system
•
•
•
•
•
•
Nose / mouth
Nasal cavity
Pharynx (throat)
Epiglottis
Larynx
Trachea
•
•
•
•
•
Bronchus (bronchi)
Bronchioles
Alveoli
Lungs
Pleura
Diaphragm
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Mouth & Nose
• Brings air into the
body
• Nasal hairs in
nostrils trap dust
Nasal cavity
• Warms & moistens air
• Glands that produce sticky mucus line
the nasal cavity
– traps dust, pollen, and other materials that
were not trapped by nasal hairs
– cilia sweep mucus and trapped material to
the back of the throat where it can be
swallowed
Pharynx
• Tube-like
passageway used
by food, liquid, and
air
• At the lower end of
the pharynx is a flap
of tissue called the
epiglottis
Larynx
• “Voice box”
• The airway to which two pairs of
horizontal folds of tissue, called vocal
cords, are attached
Trachea
• Air-conducting tube
• Connects the larynx
with the bronchi
• Lined with mucous
membranes and
cilia
• Contains strong
cartilage rings
Bronchi
• Two short tubes that
branch off the lower
end of the trachea
• Carry air into the
lungs.
• Singular - bronchus
Bronchioles
• Tiny branches of air
tubes in the lungs
• Connect bronchi to
alveoli
Alveoli
• Tiny, thin-walled,
grapelike clusters at
the end of each
bronchiole
• Surrounded by
capillaries
• Where carbon
dioxide and oxygen
exchange take place
• Singular - alveolus
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http://www.borg.com/~lubehawk/hrespsys.htm
Pleura
• Membrane lining
the lungs and
chest cavity
Diaphragm
• Muscle wall between the chest and the abdomen that
the body uses for breathing
Inhale 02, our diaphragm
contacts and pulls down, rib
expand, lungs Inflate
Exhale CO2, diaphragm
relaxes and moves up our
ribs go back in, and Our lungs
deflate.