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by
younje2011
, created
more than 1 year ago
edexel igcse Biology Note on Gas Exchange in the body, created by younje2011 on 15/01/2014.
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biology
biology
edexel igcse
Created by
younje2011
almost 11 years ago
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485530
note
2017-01-15T00:31:21Z
Breathing in
Diaphragm muscles
contract
and diaphragm is pulled
flat
.
Intercostal muscles
contract
and rib cage is pulled
up and out
.
Volume of the thorax
increases
Pressure of the thorax
decreases
Air moves from high pressure outside to a low pressure inside, down a pressure gradient
Air is
drawn into
the lungs
485530
note
2017-01-15T00:31:21Z
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