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4653059
Inspiration & Expiration
Description
A-Level Biology (Gas Exchange) Mind Map on Inspiration & Expiration, created by Fauzia Ali on 25/02/2016.
No tags specified
biology
gas exchange
a-level
Mind Map by
Fauzia Ali
, updated more than 1 year ago
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Created by
Fauzia Ali
over 8 years ago
8
1
0
Resource summary
Inspiration & Expiration
Expiration
External intercostal muscles relax pulling ribcage down and in
Diaphragm relaxes and domes upwards
Thorax volume decreases, so thorax pressure increases
Inner pleural membrane moves inwards pushing on surface of lungs so alveoli contract
Atmospheric air pressure lower than thorax pressure so air forced out
Inspiration
Negative Pressure Inhhalation
External intercostal muscles contract raising and pushing out the ribcage
Simultaneously, diaphragm contracts flattenning it
Thorax volume increases, decreasing thorax pressure
Inner pleural membrane moves outwards pulling on surface of lungs so alveoli expand
Atmospheric air pressure higher than thorax pressure so air forced in
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