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Topic 4 - respiratory system
Breathing Volumes
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Sophie Hawthorn
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The composition of air inhaled by the lungs is
21
% oxygen,
79
% nitrogen, and
0.04
% carbon dioxide
The composition of air exhaled by the lungs is
21
% oxygen,
79
% nitrogen, and
4
% carbon dioxide
During exercise the amount of oxygen in inhaled air will
increase
and in the exhaled air will
decrease
During exercise the composition of nitrogen in inhaled and exhaled air will
stay the same
During exercise the composition of carbon dioxide in inhaled air will
stay the same
and in exhaled air will
increase
What are the two muscles involved in respiration?
Intercostal muscles
diaphragm
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