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The brains of whales may be shielded from harm
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by a complex network of blood arteries from the intense blood pressure
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pulses produced by swimming
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When a whale holds its breath and moves its tail up and down in the water
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a wave of pressure is sent from the tail to the head
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Brain damage would generally result from this, but whales are able to avoid it
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According to Robert Shadwick of the University of British Columbia in Canada
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the squeezing activities cause pressure pulses that can flow through the blood through veins or arteries
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Whales cannot reduce the locomotion-induced pulses by exhaling air, unlike a sprinting animal