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It's a good rule but in extreme cases I'm sure it can go either way such as free-divers who can hold their breath for five to ten minutes when diving but the wo
by dhughes 13y ago
It's a good rule but in extreme cases I'm sure it can go either way such as free-divers who can hold their breath for five to ten minutes when diving but the world record is 22 minutes (when not diving).
- x0x0 13y agoThat's because as you descend, the partial pressure of oxygen increases. You require somewhere north of 0.10 Pa02 for consciousness; at sea level you have 0.21 Pa02. So you can consume enough oxygen at depth that when you rise you grey or black out; it's common enough that if you take a breath-hold diving course they will train you to 1 - know how it occurs; 2 - dive in pairs (always one up, one down); and 3 - make sure you are weighted so that your body is buoyant by 20 ft or so.
- muloka 13y agoAlso when under pressure the spleen shrinks substantially which raises the level of oxygen-enriched hemoglobin.
- dhughes 13y agoI've read plasma gets squished out of your blood and fills body cavities such as sinuses to keep your head from imploding.
- 14113 13y agothere's also a reflex which causes your hearth rate and breathing to slow if you feel cold water on your face.