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Cards (165)
What arises the need for specialised exchange surfaces?
Increased
size
and
surface area to volume ratio
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Why can single-celled organisms easily exchange substances?
They have a short
distance
to cross
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What do multicellular organisms require for efficient gas exchange?
Specialised
exchange surfaces
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What are features of an efficient exchange surface?
Large
surface area
and thin
structure
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Why is a good blood supply important for exchange surfaces?
It maintains a steep
concentration gradient
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How many pairs of gills do bony fish have?
Four
pairs
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What is the function of lamellae in fish gills?
They participate in
gas exchange
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How does blood and water flow across the lamellae?
In a
counter current
direction
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Why can't fish survive long out of water?
Gills
stick together without water
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What initiates ventilation in fish?
Opening the mouth and lowering the
buccal
cavity
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What role does the operculum play in fish ventilation?
Acts as a
valve
and
pump
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How do insects transport oxygen to tissues?
Through
spiracles
and
tracheae
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What are spiracles in insects?
Small
openings
for
gas exchange
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How do gases move in and out of insect tracheoles?
Through
diffusion
and
mass transport
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What adaptations do plant leaves have for gas exchange?
Stomata
and
air spaces
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What is the function of stomata in leaves?
Allow gases to enter and exit
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What is the structure of the lungs in mammals?
A pair of
lobed
structures
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What protects the lungs in the chest cavity?
The
rib cage
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What prevents friction between the rib cage and lungs?
A
lubricating substance
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What muscles are involved in ventilation?
Intercostal muscles
and
diaphragm
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How does air enter the lungs?
Through the
trachea
,
bronchi
, and
bronchioles
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Where does gaseous exchange occur in mammals?
In the walls of
alveoli
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What keeps the airways open?
Rings of
cartilage
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How do trachea and bronchi differ?
Bronchi are
narrower
than trachea
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What is the composition of the airway walls?
Cartilage
,
smooth muscle
, and
elastic fibres
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What type of epithelium is found in the airways?
Ciliated epithelium
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What is the role of goblet cells in the airways?
Secrete mucus to trap
bacteria
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How do smooth muscles affect airflow?
They control the
diameter
of the airway
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What do elastic fibres do during breathing?
Stretch when
exhaling
and recoil when inhaling
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What is ventilation composed of?
Inspiration
and
expiration
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What happens during inspiration?
Volume
in
thorax
increases, pressure decreases
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What occurs during expiration?
Volume in
thorax
decreases
, pressure
increases
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What is a spirometer used for?
Measuring
lung volume
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What is vital capacity?
Maximum
volume of air in a breath
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What is tidal volume?
Volume of air
breathed
at rest
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How is breathing rate calculated?
By counting peaks in
spirometer
trace
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What is residual volume?
Air always present in the
lungs
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What is inspiratory reserve volume?
Additional air breathed in during
exercise
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What is expiratory reserve volume?
Additional air exhaled beyond
tidal volume
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What is digestion?
Hydrolysis
of large molecules into smaller ones
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