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Unit 4 - Gas Exchange
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What is the primary job of the lungs?
Lungs are the organs of Breathing
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How many lobes does the left lung have?
Two
lobes
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How many lobes does the right lung have?
Three
lobes
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Why is the left lung smaller than the right lung?
The left lung is smaller as it fits around the heart
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What is gas exchange?
The process of oxygen and carbon dioxide moving between the lungs and the blood
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What is the texture of the lungs?
Very
spongy
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What is the function of the trachea?
Carries air into the lungs from the mouth and nose
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What prevents the trachea from collapsing?
Rings of
cartilage
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What do bronchi do?
Carry air into each
lung
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What are bronchioles?
Smaller tubes carrying air from bronchi to alveoli
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What is the function of alveoli?
Site of
gas exchange
. Where oxygen enters the blood and carbon dioxide is removed from the blood
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What is the diaphragm's role in breathing?
Changes
shape
to
allow
breathing
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What protects the heart and lungs?
Ribcage
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What is inhalation?
Taking air into the
lungs
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What do intercostal muscles do during inhalation?
Contract
to move
ribcage
up
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What happens during exhalation?
Air is pushed out of the
lungs
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What happens to the diaphragm during exhalation?
Relaxes
and becomes
dome-shaped
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What is the effect of inhalation on chest volume?
Increases
the
volume
of the
chest
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What happens to lung pressure during inhalation?
Decreases
the
pressure
in
lungs
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Where does gas exchange occur?
In the
alveoli
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What are the features of alveoli that aid gas exchange?
Moist
,
thin walls
, large
surface area
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What is diffusion in the context of gas exchange?
Movement from high to low
concentration
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What gas diffuses from alveoli into blood?
Oxygen
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What gas diffuses from blood into alveoli?
Carbon dioxide
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What are capillaries?
Tiny
blood vessels
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How do gases move in the alveoli?
By
diffusion
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