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Why do animals like seals, that are physiologically advantaged for long dives underwater, experience tachycardia when...

Why do animals like seals, that are physiologically advantaged for long dives underwater, experience tachycardia when they come out of the water?? Please give a detailed explanation on the function of this tachycardia.

Science   Anatomy-And-Physiology   
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During surface breaks, it has been assumed that the mechanical properties and extents of the aorta in mixture with the wavelengths of pressure waves produced with heart rates above 20 bpm permit destructive interference of imitated and outgoing pressure waves. So, this process reduces the impedance in contradiction of the heart which must work to eject blood throughout the cardiac cycle. This is the function of post-dive tachycardia, which also important for storing oxygen in seals like animals. The stored oxygen helps them to get adequate oxygen during the dive.

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