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Topic 4 - respiratory system
Gas exchange
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Sophie Hawthorn
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Here is what happens during gas exchange, label the parts with blood in, blood out, alveoli, oxygen in, carbon dioxide out
:
A)
Blood in
B)
carbon dioxide out
C)
oxygen in
D)
alveoli
E)
blood out
5
Carbon dioxide is going to
diffuse
from the
capillary
to the
alveoli
from a
high
concentration to a
low
concentration
Oxygen is going to
diffuse
from the
alveoli
to the
capillaries
from a
high
concentration to a
low
concentration
Gaseous exchange structure:
The alveoli are covered in
capillaries
and have a
large
red
blood cell
supply
Capillaries are close to the alveoli so the diffusion distance is
short
Alveoli have a
large
surface area to allow diffusion to take place
Thin
walls allows quick diffusion
Gases move from areas of
high
concentration to
low
concentration
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