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paper 1
cardiorespiratory system
pathway of air
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Eve Gaunt
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Cards (3)
pathway of air
nose
/
mouth
trachea
bronci
bronchioles
alveoli
oxygen
that has been breathed in passes through the
alveoli
and into the red blood cells in the capillaries
in
capillaries
,
oxygen
binds with hydrogen to form
oxyhaemoglobin
and is carried around the body
haemoglobin carries
carbon dioxide
from the body to the
capillaries
the
carbon dioxide
in the capillaries passes through the
alveoli
and is breathed out
gas exchange happens in the lungs by
diffusion
carbon dioxide
and
oxygen
move down a
concentration
gradient
from high to low
there is a high concentration of
oxygen
in the alveoli so it diffuses into the
blood capillaries
where the oxygen concentration is
lower
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