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What are the uses of muscles in breathing?

Muscles help breathing by contracting and relaxing.
For example, intercostal muscles contract (upwards and outwards) and
relax (inwards and downwards) to help control breathing.
This also applies to the diaphragm, which also contracts (flattens) and
relaxes (becomes dome-shaped) to control breathing.


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Hypothesis ­ your prediction of the result.
Independent variable ­ the thing you change.
Dependent variable ­ the thing which changes due to the independent
variable changing.
Control variables ­ Factors which could affect the experiment so are kept
the same (eg. Room temperature)
Control experiment ­ an experiment done…


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