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Yes you can because hyperventilating causes you to blow off too much CO2, causing your arterial PCO2 to decrease (called hypocapnia). High levels of CO2 in the blood is the main control of the respiratory cycle, and is the drive for us to breathe.

Chemoreceptors respond to changes in CO2, and when the level is low such as after hyperventilation, these receptors trigger a reflex decrease in respiration by stimulating the respiratory center in your brain to slow down. Decreasing the number of times you breathe allows the amount of CO2 in your body to increase again from tissue metabolism (CO2 is an end product of tissue metabolism). As a result you can hold your breath longer at this time.

CORRECT ANSWER: No you can not! When your under water your brain tells you when you need to breathe so if you hypervetilate you loose a lot of the CO2 in your blood. So when you go under water after you have hyperventilated then your brain will think you don't have to breathe when you really do and it will cause you to black out without knowing so in the end it can be a life threatening thing.

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