Journal: You have learned about the harmful chemicals in
cigarette smoke and discussed other products these chemicals are
found in. These chemicals have harmful effects on the respiratory
system, as well as other body systems. Despite having this
knowledge, approximately 4000 teens will start smoking their first
cigarette today. People say knowledge = power, but this does not
always appear to be the case. Why do you think this is? What
factors influence adolescents to make poor decisions regarding
tobacco use?
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Journal: Respond: Did the video we watched last class have an
impact on you? Why or why not? Which specific scenes or information
(if any) were most influential? Why?
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Primary Function To supply the blood with oxygen in order for
the blood to deliver oxygen to all parts of the body. (This is done
through breathing.)
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Breathing In and Out Inspiration: Breathing in or inhaling
Expiration: Breathing out or exhaling Oxygen: what we breathe in
during inspiration All of the cells in our body need this to live
It is the fuel that makes all body processes run Carbon dioxide:
what we breathe out during expiration The waste product in our
bodies
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Parts of the Body Involved Nose Throat Voice box Windpipe
Lungs
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Nose Organ used during inhalation and exhalation Cilia helps
trap and filter out dust and other particles that enter during
inspiration
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Mouth With nose, warms and humidifies air entering the lungs
through inspiration.
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Pharynx AKA The Throat Carries both food and air
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Esophagus Passageway for food
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Epiglottis A small flap of tissue that covers the air passage
when we swallow Keeps food and liquid from going into lungs
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Larynx AKA The Voice Box Uppermost part of the air-only passage
Contains vocal cords, which vibrate to produce sound
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Trachea AKA The Windpipe Extends downward from base of larynx
Held open by C rings of cartilage for easy air-flow
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Bronchi Branches off of the trachea into the lungs
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Bronchioles Smaller branches off of the bronchi Contain alveoli
(air sacs)
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Alveoli Where the exchange of oxygen and carbon dioxide
actually takes place Each lung houses about 300 to 400 million
alveoli!!
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PLACE THE FOLLOWING IN THE ORDER THAT A MOLECULE OF OXYGEN
TRAVELS (FROM THE OUT-IN) BRONCHI ALVEOLI NOSE LARYNX PHARYNX MOUTH
BRONCHIOLES TRACHEA
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Ribs Protect the lungs and much of the respiratory tract
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Diaphragm Muscle that separates chest from abdomen Helps
regulate breathing by moving up and down
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When we breathe IN Diaphragm moves downward toward the abdomen
Rib muscles pull the ribs upward and outward, enlarging the chest
cavity and pulling air in through the nose or mouth
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When we breathe OUT Diaphragm moves upward Chest cavity to get
smaller and pushes the gases in the lungs up and out of the nose
and mouth.
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Pathway of Oxygen
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nose mouth larynx pharynx lung trachea R. bronchus L. bronchus
bronchiole alveoli diaphragm