A Sudden or Total Lack of Oxygen Can Cause Unconsciousness

question 17

Multiple Choice

A sudden or total lack of oxygen can cause unconsciousness in 5-10 seconds. Why?

• A) The brain has very high energy requirements and lack of oxygen reduces available energy.
• B) Oxygen is required for ventilation and lack of ventilation causes fainting.
• C) Lack of oxygen causes an increase in carbon dioxide, which is toxic.
• D) The brain needs oxygen to breathe, and when oxygen is not available, it signals the nervous system to cause fainting.

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