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biology y7 y8
Gas Exchange
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Created by
Jinnah Iqbal
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Cards (31)
What is the primary job of the lungs?
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?
It fits around the
heart
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What is gas exchange?
Oxygen
and
carbon dioxide
movement
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What is the texture of the lungs?
Very
spongy
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What is the significance of the large surface area of the lungs?
Facilitates efficient
gas exchange
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What is the trachea's function?
Carries air into the
lungs
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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 to
alveoli
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What is the function of alveoli?
Site of
gas exchange
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How does the diaphragm assist in breathing?
Changes shape to alter
chest cavity
size
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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 happens during exhalation?
Air is pushed out of the
lungs
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What do intercostal muscles do during inhalation?
Contract to move
ribcage
up
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What happens to the diaphragm during inhalation?
Contracts
and
flattens
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What is the effect of inhalation on chest volume?
Increases
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What happens to lung pressure during inhalation?
Decreases
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What is the movement of air during inhalation?
Into the lungs
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Where does gas exchange occur?
In the alveoli
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What are the features of alveoli that facilitate 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 the blood?
Oxygen
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What gas diffuses from the blood into the alveoli?
Carbon dioxide
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What are capillaries?
Tiny blood vessels
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How do capillaries relate to gas exchange?
They surround
alveoli
for gas exchange
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How do the features of alveoli enhance gas exchange efficiency?
Thin walls and large surface area optimize
diffusion
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What are the main components of the respiratory system?
Lungs
Trachea
Diaphragm
Ribs
Bronchi
Bronchioles
Alveoli
Intercostal muscles
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What are the steps of the breathing process?
Inhalation
: air enters lungs
Exhalation
: air exits lungs
Diaphragm
and
intercostal muscles
contract and relax
Changes in
chest volume
and
lung pressure
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