. Deep sea \"free divers\" test their respiratory systems by trying to dive as f
ID: 3476824 • Letter: #
Question
. Deep sea "free divers" test their respiratory systems by trying to dive as far as possible underwater with just one breath of air. The divers hyperventilate, take a deep breath, then start swimming to the greatest depth possible. Pressure gauges register the depth they attain, and this is how they compete with other divers. This is a dangerous practice, however, as they must decide when to begin their ascent with enough "reserve" to make it to the surface. Occasionally, they will pass out just before they surface -this is called "shallow water blackout." Interestingly, when asked about these incidents, divers say they really didn't feel the need to breathe; they simply lost consciousness. Speculate as to why shallow water blackout occurs, (HINT: the divers were at great depths, and are now returning to the surface).Explanation / Answer
During a normal breathing cycle:
Breathing in is triggered by increased carbon dioxide in blood that triggers its removal and cause ventilation.
During Hyperventilation:
Diver’s Assumption: Taking in extra air will provide more oxygen for longer time period to allow more stay under water without requirement of breathing.
Error in assumption/Reason of Black Out:
Post in comment if further clarification on any point needed.
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