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Get the person to breathe in and out at rest
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compelete this for about 1 minute
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obtain the trace and draw a line against all the peaks during the first minute recorded
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measure the total decrease from the first peak to the last peak
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this is representative of the oxygen uptake
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they are mobile are have large requirements
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the need to be able to remove waste products quickly
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they have a small surface area to volume ratio
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therefore diffusion is not enough
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diaphragm and ICM contract
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ribs up and out, diaphragm flattens
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volume thorax up
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pressure thorax down
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air flows in down pressure gradient
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