RegResp — KinFAST

Adaptive test — questions are selected based on your ability estimate. — Tag: VoluntaryHyperventilation

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A swimmer voluntarily hyperventilates for thirty seconds before submerging, hoping to hold their breath longer underwater. Based on the relationship between arterial PCO2 and the drive to breathe, what is the most likely physiological consequence of this strategy?

Arterial pH is lowered, blocking the chemoreceptor reflex and making breath-holding unsafe Arterial PCO2 is raised, strengthening the drive to breathe and making it harder to hold the breath Arterial PO2 is lowered, providing immediate warning to inhale once the breath-hold begins Arterial PCO2 is lowered, reducing the chemoreceptor signal to breathe and allowing a longer breath-hold but increasing the risk of losing consciousness before arterial oxygen levels are sensed as critically low

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