Voluntarily holding your breath will eventually result in:

Question

Quizplus · Accepted Answer

When someone holds their breath, two things are happening: there is a lack of oxygen being taken in and delivered to the body's tissues, and there is a buildup of carbon dioxide that is not being exhaled as it normally would. Since the chemoreceptors in the body can't detect the lack of something (i.e oxygen), they instead detect the unsafe increase in something: carbon dioxide. These sensors then override the voluntary breath-holding and force an exhalation to rid the body of carbon dioxide and stimulate oxygen intake.
While a temporary lack of oxygen does occur, it will not cause brain damage because breathing will occur before that happens.
Breathing will re-start due to an innate reflex, but it is due to increased carbon dioxide levels, not low oxygen levels.
Unconsciousness and stroke are unlikely to occur as breathing will re-start due to the reflex to rid the body of carbon dioxide.

Voluntarily Holding Your Breath Will Eventually Result In